diff --git a/src/comp/syntax/ast.rs b/src/comp/syntax/ast.rs
index c1b3b4e1636f..7f4b84ef78e1 100644
--- a/src/comp/syntax/ast.rs
+++ b/src/comp/syntax/ast.rs
@@ -489,7 +489,7 @@ enum item_ {
     item_class([ty_param], /* ty params for class */
                [@class_item], /* methods, etc. */
                              /* (not including ctor) */
-               node_id,
+               node_id,  /* ctor id */
                fn_decl, /* ctor decl */
                blk /* ctor body */
                ),