diff --git a/libobjc/ChangeLog b/libobjc/ChangeLog
index 91154b34a07..bc522133feb 100644
--- a/libobjc/ChangeLog
+++ b/libobjc/ChangeLog
@@ -1,3 +1,9 @@
+2010-12-11  Nicola Pero  <nicola.pero@meta-innovation.com>
+
+	* objc-private/module-abi-8.h (struct objc_symtab): Updated
+	description of sel_ref_cnt and refs.
+	* objc/deprecated/struct_objc_symtab.h (objc_symtab): Same change.
+	
 2010-12-06  Dave Korn  <dave.korn.cygwin@gmail.com>
 
 	PR target/40125
diff --git a/libobjc/objc-private/module-abi-8.h b/libobjc/objc-private/module-abi-8.h
index bad547834ff..3ed836c518f 100644
--- a/libobjc/objc-private/module-abi-8.h
+++ b/libobjc/objc-private/module-abi-8.h
@@ -47,8 +47,11 @@ struct objc_static_instances
    categories  defined in the module.   */
 struct objc_symtab
 {
-  unsigned long sel_ref_cnt;  /* Unknown. */
-  SEL        refs;            /* Unknown. */
+  unsigned long sel_ref_cnt;  /* Unused (always set to 0). */
+  SEL      refs;              /* The table of selectors referenced in
+                                 this module.  This is terminated by a
+                                 selector with NULL sel_id and NULL
+                                 sel_types.  */
   unsigned short cls_def_cnt; /* Number of classes compiled (defined)
                                  in the module. */
   unsigned short cat_def_cnt; /* Number of categories compiled
diff --git a/libobjc/objc/deprecated/struct_objc_symtab.h b/libobjc/objc/deprecated/struct_objc_symtab.h
index 8e14d63ee34..75bb27f1b55 100644
--- a/libobjc/objc/deprecated/struct_objc_symtab.h
+++ b/libobjc/objc/deprecated/struct_objc_symtab.h
@@ -5,8 +5,11 @@
    A Symtab contains a variable length array of pointers to classes and
    categories  defined in the module.   */
 typedef struct objc_symtab {
-  unsigned long sel_ref_cnt;                     /* Unknown. */
-  SEL        refs;                              /* Unknown. */
+  unsigned long sel_ref_cnt;  /* Unused (always set to 0). */
+  SEL      refs;              /* The table of selectors referenced in
+                                 this module.  This is terminated by a
+                                 selector with NULL sel_id and NULL
+                                 sel_types.  */
   unsigned short cls_def_cnt;                   /* Number of classes compiled
                                                   (defined) in the module. */
   unsigned short cat_def_cnt;                   /* Number of categories