diff --git a/cpu/ChangeLog b/cpu/ChangeLog
index e62e29fba5..47c86a903e 100644
--- a/cpu/ChangeLog
+++ b/cpu/ChangeLog
@@ -1,3 +1,7 @@
+2016-10-06  Alan Modra  <amodra@gmail.com>
+
+	* mep.opc (expand_string): Add fall through comment.
+
 2016-03-03  Alan Modra  <amodra@gmail.com>
 
 	* fr30.cpu (f-m4): Replace bogus comment with a better guess
diff --git a/cpu/mep.opc b/cpu/mep.opc
index 6b4e9ff821..7ed3ea8ca8 100644
--- a/cpu/mep.opc
+++ b/cpu/mep.opc
@@ -790,6 +790,7 @@ expand_string (const char *in, int first_only)
 		  break;
 		case '(':
 		  depth++;
+		  /* Fall through.  */
 		default:
 		  args[narg].len++;
 		  break;