diff --git a/crates/oxc_ast/src/generated/ast_kind.rs b/crates/oxc_ast/src/generated/ast_kind.rs
index 4e7ccc12f5ca9..d3a14a251cbbd 100644
--- a/crates/oxc_ast/src/generated/ast_kind.rs
+++ b/crates/oxc_ast/src/generated/ast_kind.rs
@@ -822,6 +822,9 @@ impl AstKind<'_> {
 }
 
 impl GetSpan for AstKind<'_> {
+    /// Get [`Span`] of an [`AstKind`].
+    // `span` field is in consistent position in all AST structs, so this boils down to 1 instruction.
+    #[inline]
     fn span(&self) -> Span {
         match self {
             Self::Program(it) => it.span(),
diff --git a/tasks/ast_tools/src/generators/ast_kind.rs b/tasks/ast_tools/src/generators/ast_kind.rs
index f217693ed335a..fb549f67cceca 100644
--- a/tasks/ast_tools/src/generators/ast_kind.rs
+++ b/tasks/ast_tools/src/generators/ast_kind.rs
@@ -211,6 +211,10 @@ impl Generator for AstKindGenerator {
 
             ///@@line_break
             impl GetSpan for AstKind<'_> {
+                ///@@line_break
+                /// Get [`Span`] of an [`AstKind`].
+                ///@ `span` field is in consistent position in all AST structs, so this boils down to 1 instruction.
+                #[inline]
                 fn span(&self) -> Span {
                     match self {
                         #span_match_arms