diff --git a/sql/opt_range.h b/sql/opt_range.h
index 57a62bbc143..d4b92015042 100644
--- a/sql/opt_range.h
+++ b/sql/opt_range.h
@@ -902,7 +902,7 @@ class SQL_SELECT :public Sql_alloc {
   key_map quick_keys;		// Possible quick keys
   key_map needed_reg;		// Possible quick keys after prev tables.
   table_map const_tables,read_tables;
-  bool	free_cond;
+  bool	free_cond; /* Currently not used and always FALSE */
 
   SQL_SELECT();
   ~SQL_SELECT();