diff --git a/src/gprs_ms.c b/src/gprs_ms.c
index f1b0c6a..5bf929e 100644
--- a/src/gprs_ms.c
+++ b/src/gprs_ms.c
@@ -527,6 +527,7 @@
 		       imsi, ms_tlli(old_ms));
 
 		ms_merge_and_clear_ms(ms, old_ms);
+		/* old_ms may no longer be available here */
 	}