1 files changed, 4 insertions, 0 deletions
diff --git a/sql/sql_lex.h b/sql/sql_lex.h
index 13e1a5c0cf8..0e916b6c1c1 100644
--- a/sql/sql_lex.h
+++ b/sql/sql_lex.h
@@ -2854,6 +2854,10 @@ struct LEX: public Query_tables_list
   String *wild; /* Wildcard in SHOW {something} LIKE 'wild'*/ 
   sql_exchange *exchange;
   select_result *result;
+  /**
+    @c the two may also hold BINLOG arguments: either comment holds a
+    base64-char string or both represent the BINLOG fragment user variables.
+  */
   LEX_CSTRING comment, ident;
   LEX_USER *grant_user;
   XID *xid;