diff --git a/util/ceg/ce_back/as_back/bottom.c b/util/ceg/ce_back/as_back/bottom.c
index faa1f129..4d5ba2e5 100644
--- a/util/ceg/ce_back/as_back/bottom.c
+++ b/util/ceg/ce_back/as_back/bottom.c
@@ -2,6 +2,7 @@
 #include "const.h"
 #include "back.h"
 
+/* This file contains low-level routines for generating assembly code. */
 
 int procno = 0, holno = 0, cur_seg = -1, saved = FALSE;
 char name[256], labeltje[256];