diff --git a/src/bindgen/ir/constant.rs b/src/bindgen/ir/constant.rs
index 7b826a69e..8542cd2c4 100644
--- a/src/bindgen/ir/constant.rs
+++ b/src/bindgen/ir/constant.rs
@@ -489,6 +489,8 @@ impl Constant {
             _ => &self.value,
         };
 
+        self.documentation.write(config, out);
+
         if config.constant.allow_static_const && config.language == Language::Cxx {
             out.write(if in_body { "inline " } else { "static " });
             if let Type::ConstPtr(..) = self.ty {
diff --git a/tests/expectations/associated_in_body.c b/tests/expectations/associated_in_body.c
index dc2444cbc..da6fe27df 100644
--- a/tests/expectations/associated_in_body.c
+++ b/tests/expectations/associated_in_body.c
@@ -11,10 +11,25 @@
 typedef struct {
   uint8_t bits;
 } StyleAlignFlags;
+/**
+ * 'auto'
+ */
 #define StyleAlignFlags_AUTO (StyleAlignFlags){ .bits = 0 }
+/**
+ * 'normal'
+ */
 #define StyleAlignFlags_NORMAL (StyleAlignFlags){ .bits = 1 }
+/**
+ * 'start'
+ */
 #define StyleAlignFlags_START (StyleAlignFlags){ .bits = (1 << 1) }
+/**
+ * 'end'
+ */
 #define StyleAlignFlags_END (StyleAlignFlags){ .bits = (1 << 2) }
+/**
+ * 'flex-start'
+ */
 #define StyleAlignFlags_FLEX_START (StyleAlignFlags){ .bits = (1 << 3) }
 
 void root(StyleAlignFlags flags);
diff --git a/tests/expectations/associated_in_body.compat.c b/tests/expectations/associated_in_body.compat.c
index e2f8990d9..b032a5938 100644
--- a/tests/expectations/associated_in_body.compat.c
+++ b/tests/expectations/associated_in_body.compat.c
@@ -11,10 +11,25 @@
 typedef struct {
   uint8_t bits;
 } StyleAlignFlags;
+/**
+ * 'auto'
+ */
 #define StyleAlignFlags_AUTO (StyleAlignFlags){ .bits = 0 }
+/**
+ * 'normal'
+ */
 #define StyleAlignFlags_NORMAL (StyleAlignFlags){ .bits = 1 }
+/**
+ * 'start'
+ */
 #define StyleAlignFlags_START (StyleAlignFlags){ .bits = (1 << 1) }
+/**
+ * 'end'
+ */
 #define StyleAlignFlags_END (StyleAlignFlags){ .bits = (1 << 2) }
+/**
+ * 'flex-start'
+ */
 #define StyleAlignFlags_FLEX_START (StyleAlignFlags){ .bits = (1 << 3) }
 
 #ifdef __cplusplus
diff --git a/tests/expectations/associated_in_body.cpp b/tests/expectations/associated_in_body.cpp
index db4596dcf..713f06e03 100644
--- a/tests/expectations/associated_in_body.cpp
+++ b/tests/expectations/associated_in_body.cpp
@@ -42,10 +42,15 @@ struct StyleAlignFlags {
   static const StyleAlignFlags END;
   static const StyleAlignFlags FLEX_START;
 };
+/// 'auto'
 inline const StyleAlignFlags StyleAlignFlags::AUTO = StyleAlignFlags{ /* .bits = */ 0 };
+/// 'normal'
 inline const StyleAlignFlags StyleAlignFlags::NORMAL = StyleAlignFlags{ /* .bits = */ 1 };
+/// 'start'
 inline const StyleAlignFlags StyleAlignFlags::START = StyleAlignFlags{ /* .bits = */ (1 << 1) };
+/// 'end'
 inline const StyleAlignFlags StyleAlignFlags::END = StyleAlignFlags{ /* .bits = */ (1 << 2) };
+/// 'flex-start'
 inline const StyleAlignFlags StyleAlignFlags::FLEX_START = StyleAlignFlags{ /* .bits = */ (1 << 3) };
 
 extern "C" {
diff --git a/tests/expectations/bitflags.c b/tests/expectations/bitflags.c
index 46e3f73eb..84a215824 100644
--- a/tests/expectations/bitflags.c
+++ b/tests/expectations/bitflags.c
@@ -11,10 +11,25 @@
 typedef struct {
   uint8_t bits;
 } AlignFlags;
+/**
+ * 'auto'
+ */
 #define AlignFlags_AUTO (AlignFlags){ .bits = 0 }
+/**
+ * 'normal'
+ */
 #define AlignFlags_NORMAL (AlignFlags){ .bits = 1 }
+/**
+ * 'start'
+ */
 #define AlignFlags_START (AlignFlags){ .bits = (1 << 1) }
+/**
+ * 'end'
+ */
 #define AlignFlags_END (AlignFlags){ .bits = (1 << 2) }
+/**
+ * 'flex-start'
+ */
 #define AlignFlags_FLEX_START (AlignFlags){ .bits = (1 << 3) }
 
 void root(AlignFlags flags);
diff --git a/tests/expectations/bitflags.compat.c b/tests/expectations/bitflags.compat.c
index 8f6a27cc3..6a31e43de 100644
--- a/tests/expectations/bitflags.compat.c
+++ b/tests/expectations/bitflags.compat.c
@@ -11,10 +11,25 @@
 typedef struct {
   uint8_t bits;
 } AlignFlags;
+/**
+ * 'auto'
+ */
 #define AlignFlags_AUTO (AlignFlags){ .bits = 0 }
+/**
+ * 'normal'
+ */
 #define AlignFlags_NORMAL (AlignFlags){ .bits = 1 }
+/**
+ * 'start'
+ */
 #define AlignFlags_START (AlignFlags){ .bits = (1 << 1) }
+/**
+ * 'end'
+ */
 #define AlignFlags_END (AlignFlags){ .bits = (1 << 2) }
+/**
+ * 'flex-start'
+ */
 #define AlignFlags_FLEX_START (AlignFlags){ .bits = (1 << 3) }
 
 #ifdef __cplusplus
diff --git a/tests/expectations/bitflags.cpp b/tests/expectations/bitflags.cpp
index 16c9fb9fd..cb350cb18 100644
--- a/tests/expectations/bitflags.cpp
+++ b/tests/expectations/bitflags.cpp
@@ -37,10 +37,15 @@ struct AlignFlags {
     return *this;
   }
 };
+/// 'auto'
 static const AlignFlags AlignFlags_AUTO = AlignFlags{ /* .bits = */ 0 };
+/// 'normal'
 static const AlignFlags AlignFlags_NORMAL = AlignFlags{ /* .bits = */ 1 };
+/// 'start'
 static const AlignFlags AlignFlags_START = AlignFlags{ /* .bits = */ (1 << 1) };
+/// 'end'
 static const AlignFlags AlignFlags_END = AlignFlags{ /* .bits = */ (1 << 2) };
+/// 'flex-start'
 static const AlignFlags AlignFlags_FLEX_START = AlignFlags{ /* .bits = */ (1 << 3) };
 
 extern "C" {
diff --git a/tests/expectations/both/associated_in_body.c b/tests/expectations/both/associated_in_body.c
index ea3c060c4..53b08359f 100644
--- a/tests/expectations/both/associated_in_body.c
+++ b/tests/expectations/both/associated_in_body.c
@@ -11,10 +11,25 @@
 typedef struct StyleAlignFlags {
   uint8_t bits;
 } StyleAlignFlags;
+/**
+ * 'auto'
+ */
 #define StyleAlignFlags_AUTO (StyleAlignFlags){ .bits = 0 }
+/**
+ * 'normal'
+ */
 #define StyleAlignFlags_NORMAL (StyleAlignFlags){ .bits = 1 }
+/**
+ * 'start'
+ */
 #define StyleAlignFlags_START (StyleAlignFlags){ .bits = (1 << 1) }
+/**
+ * 'end'
+ */
 #define StyleAlignFlags_END (StyleAlignFlags){ .bits = (1 << 2) }
+/**
+ * 'flex-start'
+ */
 #define StyleAlignFlags_FLEX_START (StyleAlignFlags){ .bits = (1 << 3) }
 
 void root(StyleAlignFlags flags);
diff --git a/tests/expectations/both/associated_in_body.compat.c b/tests/expectations/both/associated_in_body.compat.c
index cf78144b8..ce77124e7 100644
--- a/tests/expectations/both/associated_in_body.compat.c
+++ b/tests/expectations/both/associated_in_body.compat.c
@@ -11,10 +11,25 @@
 typedef struct StyleAlignFlags {
   uint8_t bits;
 } StyleAlignFlags;
+/**
+ * 'auto'
+ */
 #define StyleAlignFlags_AUTO (StyleAlignFlags){ .bits = 0 }
+/**
+ * 'normal'
+ */
 #define StyleAlignFlags_NORMAL (StyleAlignFlags){ .bits = 1 }
+/**
+ * 'start'
+ */
 #define StyleAlignFlags_START (StyleAlignFlags){ .bits = (1 << 1) }
+/**
+ * 'end'
+ */
 #define StyleAlignFlags_END (StyleAlignFlags){ .bits = (1 << 2) }
+/**
+ * 'flex-start'
+ */
 #define StyleAlignFlags_FLEX_START (StyleAlignFlags){ .bits = (1 << 3) }
 
 #ifdef __cplusplus
diff --git a/tests/expectations/both/bitflags.c b/tests/expectations/both/bitflags.c
index dff9ea6db..d905454f8 100644
--- a/tests/expectations/both/bitflags.c
+++ b/tests/expectations/both/bitflags.c
@@ -11,10 +11,25 @@
 typedef struct AlignFlags {
   uint8_t bits;
 } AlignFlags;
+/**
+ * 'auto'
+ */
 #define AlignFlags_AUTO (AlignFlags){ .bits = 0 }
+/**
+ * 'normal'
+ */
 #define AlignFlags_NORMAL (AlignFlags){ .bits = 1 }
+/**
+ * 'start'
+ */
 #define AlignFlags_START (AlignFlags){ .bits = (1 << 1) }
+/**
+ * 'end'
+ */
 #define AlignFlags_END (AlignFlags){ .bits = (1 << 2) }
+/**
+ * 'flex-start'
+ */
 #define AlignFlags_FLEX_START (AlignFlags){ .bits = (1 << 3) }
 
 void root(AlignFlags flags);
diff --git a/tests/expectations/both/bitflags.compat.c b/tests/expectations/both/bitflags.compat.c
index ab8643cff..bbd9d1500 100644
--- a/tests/expectations/both/bitflags.compat.c
+++ b/tests/expectations/both/bitflags.compat.c
@@ -11,10 +11,25 @@
 typedef struct AlignFlags {
   uint8_t bits;
 } AlignFlags;
+/**
+ * 'auto'
+ */
 #define AlignFlags_AUTO (AlignFlags){ .bits = 0 }
+/**
+ * 'normal'
+ */
 #define AlignFlags_NORMAL (AlignFlags){ .bits = 1 }
+/**
+ * 'start'
+ */
 #define AlignFlags_START (AlignFlags){ .bits = (1 << 1) }
+/**
+ * 'end'
+ */
 #define AlignFlags_END (AlignFlags){ .bits = (1 << 2) }
+/**
+ * 'flex-start'
+ */
 #define AlignFlags_FLEX_START (AlignFlags){ .bits = (1 << 3) }
 
 #ifdef __cplusplus
diff --git a/tests/expectations/both/constant.c b/tests/expectations/both/constant.c
index 66cb9faae..b5045b992 100644
--- a/tests/expectations/both/constant.c
+++ b/tests/expectations/both/constant.c
@@ -13,10 +13,19 @@
 
 #define LEFTCURLY '{'
 
+/**
+ * A
+ * multi-line
+ * doc
+ * comment.
+ */
 #define NEG_ONE -1
 
 #define NEWLINE '\n'
 
+/**
+ * A single-line doc comment.
+ */
 #define POS_ONE 1
 
 #define QUOTE '\''
diff --git a/tests/expectations/both/constant.compat.c b/tests/expectations/both/constant.compat.c
index 2e457bc4a..8dd0dfec4 100644
--- a/tests/expectations/both/constant.compat.c
+++ b/tests/expectations/both/constant.compat.c
@@ -13,10 +13,19 @@
 
 #define LEFTCURLY '{'
 
+/**
+ * A
+ * multi-line
+ * doc
+ * comment.
+ */
 #define NEG_ONE -1
 
 #define NEWLINE '\n'
 
+/**
+ * A single-line doc comment.
+ */
 #define POS_ONE 1
 
 #define QUOTE '\''
diff --git a/tests/expectations/constant.c b/tests/expectations/constant.c
index 9ce9438a0..0ba126db1 100644
--- a/tests/expectations/constant.c
+++ b/tests/expectations/constant.c
@@ -13,10 +13,19 @@
 
 #define LEFTCURLY '{'
 
+/**
+ * A
+ * multi-line
+ * doc
+ * comment.
+ */
 #define NEG_ONE -1
 
 #define NEWLINE '\n'
 
+/**
+ * A single-line doc comment.
+ */
 #define POS_ONE 1
 
 #define QUOTE '\''
diff --git a/tests/expectations/constant.compat.c b/tests/expectations/constant.compat.c
index b8e71cdc5..13e17c43e 100644
--- a/tests/expectations/constant.compat.c
+++ b/tests/expectations/constant.compat.c
@@ -13,10 +13,19 @@
 
 #define LEFTCURLY '{'
 
+/**
+ * A
+ * multi-line
+ * doc
+ * comment.
+ */
 #define NEG_ONE -1
 
 #define NEWLINE '\n'
 
+/**
+ * A single-line doc comment.
+ */
 #define POS_ONE 1
 
 #define QUOTE '\''
diff --git a/tests/expectations/constant.cpp b/tests/expectations/constant.cpp
index 238384644..6bee53b6b 100644
--- a/tests/expectations/constant.cpp
+++ b/tests/expectations/constant.cpp
@@ -13,10 +13,15 @@ static const uint32_t HEART = L'\U00002764';
 
 static const uint32_t LEFTCURLY = '{';
 
+/// A
+/// multi-line
+/// doc
+/// comment.
 static const int8_t NEG_ONE = -1;
 
 static const uint32_t NEWLINE = '\n';
 
+/// A single-line doc comment.
 static const int8_t POS_ONE = 1;
 
 static const uint32_t QUOTE = '\'';
diff --git a/tests/expectations/tag/associated_in_body.c b/tests/expectations/tag/associated_in_body.c
index f8ccc5791..8aacc685c 100644
--- a/tests/expectations/tag/associated_in_body.c
+++ b/tests/expectations/tag/associated_in_body.c
@@ -11,10 +11,25 @@
 struct StyleAlignFlags {
   uint8_t bits;
 };
+/**
+ * 'auto'
+ */
 #define StyleAlignFlags_AUTO (StyleAlignFlags){ .bits = 0 }
+/**
+ * 'normal'
+ */
 #define StyleAlignFlags_NORMAL (StyleAlignFlags){ .bits = 1 }
+/**
+ * 'start'
+ */
 #define StyleAlignFlags_START (StyleAlignFlags){ .bits = (1 << 1) }
+/**
+ * 'end'
+ */
 #define StyleAlignFlags_END (StyleAlignFlags){ .bits = (1 << 2) }
+/**
+ * 'flex-start'
+ */
 #define StyleAlignFlags_FLEX_START (StyleAlignFlags){ .bits = (1 << 3) }
 
 void root(struct StyleAlignFlags flags);
diff --git a/tests/expectations/tag/associated_in_body.compat.c b/tests/expectations/tag/associated_in_body.compat.c
index 22f6cbd8c..5f4cdd634 100644
--- a/tests/expectations/tag/associated_in_body.compat.c
+++ b/tests/expectations/tag/associated_in_body.compat.c
@@ -11,10 +11,25 @@
 struct StyleAlignFlags {
   uint8_t bits;
 };
+/**
+ * 'auto'
+ */
 #define StyleAlignFlags_AUTO (StyleAlignFlags){ .bits = 0 }
+/**
+ * 'normal'
+ */
 #define StyleAlignFlags_NORMAL (StyleAlignFlags){ .bits = 1 }
+/**
+ * 'start'
+ */
 #define StyleAlignFlags_START (StyleAlignFlags){ .bits = (1 << 1) }
+/**
+ * 'end'
+ */
 #define StyleAlignFlags_END (StyleAlignFlags){ .bits = (1 << 2) }
+/**
+ * 'flex-start'
+ */
 #define StyleAlignFlags_FLEX_START (StyleAlignFlags){ .bits = (1 << 3) }
 
 #ifdef __cplusplus
diff --git a/tests/expectations/tag/bitflags.c b/tests/expectations/tag/bitflags.c
index 2c26bdddd..9a35d3d8e 100644
--- a/tests/expectations/tag/bitflags.c
+++ b/tests/expectations/tag/bitflags.c
@@ -11,10 +11,25 @@
 struct AlignFlags {
   uint8_t bits;
 };
+/**
+ * 'auto'
+ */
 #define AlignFlags_AUTO (AlignFlags){ .bits = 0 }
+/**
+ * 'normal'
+ */
 #define AlignFlags_NORMAL (AlignFlags){ .bits = 1 }
+/**
+ * 'start'
+ */
 #define AlignFlags_START (AlignFlags){ .bits = (1 << 1) }
+/**
+ * 'end'
+ */
 #define AlignFlags_END (AlignFlags){ .bits = (1 << 2) }
+/**
+ * 'flex-start'
+ */
 #define AlignFlags_FLEX_START (AlignFlags){ .bits = (1 << 3) }
 
 void root(struct AlignFlags flags);
diff --git a/tests/expectations/tag/bitflags.compat.c b/tests/expectations/tag/bitflags.compat.c
index 3b35e5950..e7cb2a04c 100644
--- a/tests/expectations/tag/bitflags.compat.c
+++ b/tests/expectations/tag/bitflags.compat.c
@@ -11,10 +11,25 @@
 struct AlignFlags {
   uint8_t bits;
 };
+/**
+ * 'auto'
+ */
 #define AlignFlags_AUTO (AlignFlags){ .bits = 0 }
+/**
+ * 'normal'
+ */
 #define AlignFlags_NORMAL (AlignFlags){ .bits = 1 }
+/**
+ * 'start'
+ */
 #define AlignFlags_START (AlignFlags){ .bits = (1 << 1) }
+/**
+ * 'end'
+ */
 #define AlignFlags_END (AlignFlags){ .bits = (1 << 2) }
+/**
+ * 'flex-start'
+ */
 #define AlignFlags_FLEX_START (AlignFlags){ .bits = (1 << 3) }
 
 #ifdef __cplusplus
diff --git a/tests/expectations/tag/constant.c b/tests/expectations/tag/constant.c
index 01b1537f4..abfa08838 100644
--- a/tests/expectations/tag/constant.c
+++ b/tests/expectations/tag/constant.c
@@ -13,10 +13,19 @@
 
 #define LEFTCURLY '{'
 
+/**
+ * A
+ * multi-line
+ * doc
+ * comment.
+ */
 #define NEG_ONE -1
 
 #define NEWLINE '\n'
 
+/**
+ * A single-line doc comment.
+ */
 #define POS_ONE 1
 
 #define QUOTE '\''
diff --git a/tests/expectations/tag/constant.compat.c b/tests/expectations/tag/constant.compat.c
index 7df997fa6..4275dcaa8 100644
--- a/tests/expectations/tag/constant.compat.c
+++ b/tests/expectations/tag/constant.compat.c
@@ -13,10 +13,19 @@
 
 #define LEFTCURLY '{'
 
+/**
+ * A
+ * multi-line
+ * doc
+ * comment.
+ */
 #define NEG_ONE -1
 
 #define NEWLINE '\n'
 
+/**
+ * A single-line doc comment.
+ */
 #define POS_ONE 1
 
 #define QUOTE '\''
diff --git a/tests/rust/constant.rs b/tests/rust/constant.rs
index 1f483cd4a..1c59a50ff 100644
--- a/tests/rust/constant.rs
+++ b/tests/rust/constant.rs
@@ -12,7 +12,12 @@ pub const ZOM: f32 = 3.14;
 pub(crate) const DONT_EXPORT_CRATE: i32 = 20;
 const DONT_EXPORT_PRIV: i32 = 30;
 
+/// A single-line doc comment.
 pub const POS_ONE: i8 = 1;
+/// A
+/// multi-line
+/// doc
+/// comment.
 pub const NEG_ONE: i8 = -1;
 
 // Some doc for shifting //