diff --git a/documentation/0.doxygen/example/include/enum.h b/documentation/0.doxygen/example/include/enum.h
index 14fda47b086..a4a9cd53528 100644
--- a/documentation/0.doxygen/example/include/enum.h
+++ b/documentation/0.doxygen/example/include/enum.h
@@ -14,15 +14,23 @@
  *
  * See
  * <a href="https://github.com/RT-Thread/rt-thread/blob/master/documentation/0.doxygen/example/include/enum.h">documentation/0.doxygen/example/include/enum.h</a>
- * for example.
+ * for code example.
+ *
+ * See
+ * <a href="./group__group__doxygen__example__enum.html">Doxygen Example of Enumeration</a>
+ * for html output.
  */
 
 /**
- * @addtogroup group_doxygen_example
+ * @defgroup group_doxygen_example_enum Doxygen Example of Enumeration
+ *
+ * @ingroup group_doxygen_example
+ *
+ * @brief Doxygen Example of Enumeration.
+ *
+ * @{
  */
 
-/** @{ */
-
 /**
  * @brief Brief description of this enumeration
  */
diff --git a/documentation/0.doxygen/example/include/groups.h b/documentation/0.doxygen/example/include/groups.h
index 04b14d43fcc..71ea20d83cc 100644
--- a/documentation/0.doxygen/example/include/groups.h
+++ b/documentation/0.doxygen/example/include/groups.h
@@ -24,14 +24,18 @@
  *
  * See
  * <a href="https://github.com/RT-Thread/rt-thread/blob/master/documentation/0.doxygen/example/include/groups.h">documentation/0.doxygen/example/include/groups.h</a>
- * for example.
+ * for code example.
+ *
+ * See
+ * <a href="./group__group__doxygen__example__sub.html">Doxygen Example of Groups and Sub-Groups</a>
+ * for html output.
  *
  * More information can be found in the Doxygen manual:
  * <a href="https://www.doxygen.nl/manual/grouping.html">Grouping</a>.
  */
 
 /**
- * @defgroup group_doxygen_example_sub Sub Group of Doxygen Example
+ * @defgroup group_doxygen_example_sub Doxygen Example of Groups
  *
  * All members of this group will be displayed in one HTML page.
  *
diff --git a/documentation/0.doxygen/example/include/macro.h b/documentation/0.doxygen/example/include/macro.h
index a5c1d7f352d..b849909eb54 100644
--- a/documentation/0.doxygen/example/include/macro.h
+++ b/documentation/0.doxygen/example/include/macro.h
@@ -10,7 +10,7 @@
  *   recommend putting documentation after members. See `DOXYGEN_EXAMPLE_CONST_A`
  *   and `DOXYGEN_EXAMPLE_CONST_B` in
  *   <a href="https://github.com/RT-Thread/rt-thread/blob/master/documentation/0.doxygen/example/include/macro.h">documentation/0.doxygen/example/include/macro.h</a>
- *   for exmaple.
+ *   for code exmaple.
  *
  * - The other is to define macros with parameters. For this type of
  *   macro, we recommend using a method similar to documenting for
@@ -18,15 +18,23 @@
  *   More details please see @ref page_howto_function
  *   See `DOXYGEN_EXAMPLE_ABS` in
  *   <a href="https://github.com/RT-Thread/rt-thread/blob/master/documentation/0.doxygen/example/include/macro.h">documentation/0.doxygen/example/include/macro.h</a>
- *   for example.
+ *   for code example.
+ *
+ * See
+ * <a href="./group__group__doxygen__example__macro.html">Doxygen Example of Macro</a>
+ * for html output.
  */
 
-/**
- * @addtogroup group_doxygen_example
+ /**
+ * @defgroup group_doxygen_example_macro Doxygen Example of Macro
+ *
+ * @ingroup group_doxygen_example
+ *
+ * @brief Doxygen Example of Macro.
+ *
+ * @{
  */
 
-/** @{ */
-
 #define DOXYGEN_EXAMPLE_CONST_A 100 /**< Description of macro const A */
 #define DOXYGEN_EXAMPLE_CONST_B 200 /**< Description of macro const B */
 
diff --git a/documentation/0.doxygen/example/include/struct.h b/documentation/0.doxygen/example/include/struct.h
index 528e85487ab..46f130319d9 100644
--- a/documentation/0.doxygen/example/include/struct.h
+++ b/documentation/0.doxygen/example/include/struct.h
@@ -18,15 +18,23 @@
  *
  * See
  * <a href="https://github.com/RT-Thread/rt-thread/blob/master/documentation/0.doxygen/example/include/struct.h">documentation/0.doxygen/example/include/struct.h</a>
- * for example.
+ * for code example.
+ *
+ * See
+ * <a href="./group__group__doxygen__example__struct.html">Doxygen Example of Structure</a>
+ * for html output.
  */
 
 /**
- * @addtogroup group_doxygen_example
+ * @defgroup group_doxygen_example_struct Doxygen Example of Structure
+ *
+ * @ingroup group_doxygen_example
+ *
+ * @brief Doxygen Example of Structure.
+ *
+ * @{
  */
 
-/** @{ */
-
 /**
  * @brief Brief description this structure
  *
diff --git a/documentation/0.doxygen/example/include/typedef.h b/documentation/0.doxygen/example/include/typedef.h
index eeb004fb5b9..2232f31bc69 100644
--- a/documentation/0.doxygen/example/include/typedef.h
+++ b/documentation/0.doxygen/example/include/typedef.h
@@ -26,18 +26,26 @@
  *
  * See
  * <a href="https://github.com/RT-Thread/rt-thread/blob/master/documentation/0.doxygen/example/include/typedef.h">documentation/0.doxygen/example/include/typedef.h</a>
- * for example.
+ * for code example.
+ *
+ * See
+ * <a href="./group__group__doxygen__example__typedef.html">Doxygen Example of Typedef</a>
+ * for html output.
  */
 
 #include "struct.h"
 #include "enum.h"
 
 /**
- * @addtogroup group_doxygen_example
+ * @defgroup group_doxygen_example_typedef Doxygen Example of Typedef
+ *
+ * @ingroup group_doxygen_example
+ *
+ * @brief Doxygen Example of Typedef.
+ *
+ * @{
  */
 
-/** @{ */
-
 /**
  * @typedef dogygen_example_struct_t
  * Alias of `struct dogygen_example_struct`.
@@ -49,7 +57,7 @@ typedef struct dogygen_example_struct dogygen_example_struct_t;
 typedef struct dogygen_example_struct_another dogygen_example_struct_another_t;
 
 /**
- * @typedef doxygen_example_enum
+ * @typedef doxygen_example_enum_t
  * Alias of `enum doxygen_example_enum`.
  */
 typedef enum doxygen_example_enum doxygen_example_enum_t;
diff --git a/documentation/0.doxygen/example/include/union.h b/documentation/0.doxygen/example/include/union.h
index 1af9f13ef2b..9dbf2e47445 100644
--- a/documentation/0.doxygen/example/include/union.h
+++ b/documentation/0.doxygen/example/include/union.h
@@ -14,15 +14,23 @@
  *
  * See
  * <a href="https://github.com/RT-Thread/rt-thread/blob/master/documentation/0.doxygen/example/include/union.h">documentation/0.doxygen/example/include/union.h</a>
- * for example.
+ * for code example.
+ *
+ * See
+ * <a href="./group__group__doxygen__example__union.html">Doxygen Example of Union</a>
+ * for html output.
  */
 
 /**
- * @addtogroup group_doxygen_example
+ * @defgroup group_doxygen_example_union Doxygen Example of Union
+ *
+ * @ingroup group_doxygen_example
+ *
+ * @brief Doxygen Example of Union.
+ *
+ * @{
  */
 
-/** @{ */
-
 /**
  * @brief Brief description of this union
  */
diff --git a/documentation/0.doxygen/example/src/function.c b/documentation/0.doxygen/example/src/function.c
index 6ac5dc90de1..289c09b2ce8 100644
--- a/documentation/0.doxygen/example/src/function.c
+++ b/documentation/0.doxygen/example/src/function.c
@@ -43,17 +43,27 @@
  *
  * See
  * <a href="https://github.com/RT-Thread/rt-thread/blob/master/documentation/0.doxygen/example/src/function.c">documentation/0.doxygen/example/src/function.c</a>
- * for example.
+ * for code example.
  *
- * <a href="https://github.com/RT-Thread/rt-thread/blob/master/documentation/0.doxygen/example/src/function.h">documentation/0.doxygen/example/src/function.h</a> is an example of the header file where we just declare the API without doxygen documentation.
+ * See
+ * <a href="./group__group__doxygen__example__function.html">Doxygen Example of Function</a>
+ * for html output.
+ *
+ * @note <a href="https://github.com/RT-Thread/rt-thread/blob/master/documentation/0.doxygen/example/src/function.h">documentation/0.doxygen/example/src/function.h</a>
+ * is just an example of the header file where we declare the API without
+ * doxygen documentation.
  */
 
 /**
- * @addtogroup group_doxygen_example
+ * @defgroup group_doxygen_example_function Doxygen Example of Function
+ *
+ * @ingroup group_doxygen_example
+ *
+ * @brief Doxygen Example of Function.
+ *
+ * @{
  */
 
-/** @{ */
-
 /**
  * @brief Brief description for the function
  *