diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 8146deaff61..68d1db9719f 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2014-08-07  Yao Qi  <yao@codesourcery.com>
+
+	* dwarf2read.c (struct dwarf2_per_cu_data) <u>: Tweak comments.
+
 2014-08-07  Yao Qi  <yao@codesourcery.com>
 
 	PR remote/17230
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 098f5a3963c..abe47d100c7 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -611,8 +611,8 @@ struct dwarf2_per_cu_data
      However we can enter this file with just a "per_cu" handle.  */
   struct objfile *objfile;
 
-  /* When using partial symbol tables, the 'psymtab' field is active.
-     Otherwise the 'quick' field is active.  */
+  /* When dwarf2_per_objfile->using_index is true, the 'quick' field
+     is active.  Otherwise, the 'psymtab' field is active.  */
   union
   {
     /* The partial symbol table associated with this compilation unit,