diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2cd58cfe299..789042d0077 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2005-11-28  Alexandre Oliva  <aoliva@redhat.com>
+
+	* varasm.c (ultimate_transparent_alias_target): Add comment.
+
 2005-11-28  Kazu Hirata  <kazu@codesourcery.com>
 
 	* config/m68k/m68k.c (notice_update_cc): Use SET_DEST and
diff --git a/gcc/varasm.c b/gcc/varasm.c
index 68a46eab5e2..fa181e17f1e 100644
--- a/gcc/varasm.c
+++ b/gcc/varasm.c
@@ -1996,6 +1996,14 @@ mark_decl_referenced (tree decl)
      which do not need to be marked.  */
 }
 
+
+/* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
+   until we find an identifier that is not itself a transparent alias.
+   Modify the alias passed to it by reference (and all aliases on the
+   way to the ultimate target), such that they do not have to be
+   followed again, and return the ultimate target of the alias
+   chain.  */
+
 static inline tree
 ultimate_transparent_alias_target (tree *alias)
 {