diff --git a/ChangeLog b/ChangeLog
index 7b2a305868..6eec9e4962 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jan 25 12:01:56 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_core.h: modify a comment about rb_iseq_t::local_size.
+	  A patch by davidbalbert (David Albert) [Bug #6750]
+
 Fri Jan 25 10:36:31 2013  Eric Hodel  <drbrain@segment7.net>
 
 	* lib/mkmf.rb:  Documented MakeMakefile constants.  Hide implementation
diff --git a/vm_core.h b/vm_core.h
index 2e1509b373..7526c2004e 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -225,7 +225,7 @@ struct rb_iseq_struct {
     ID *local_table;		/* must free */
     int local_table_size;
 
-    /* method, class frame: sizeof(vars) + 1, block frame: sizeof(vars) */
+    /* sizeof(vars) + 1 */
     int local_size;
 
     struct iseq_inline_cache_entry *ic_entries;