diff --git a/include/osmocom/gsm/cbsp.h b/include/osmocom/gsm/cbsp.h
index 90516cb..5ed973a 100644
--- a/include/osmocom/gsm/cbsp.h
+++ b/include/osmocom/gsm/cbsp.h
@@ -6,7 +6,7 @@
 #include <osmocom/gsm/gsm0808_utils.h>
 
 /* Definitions for parsed / abstract representation of messages in the
- * CBSP (Cell Broadcast Service Protocol).  Data here is *not* formatted
+ * CBSP (Cell Broadcast Service Protocol, 3GPP TS 48.049).  Data here is *not* formatted
  * like the * on-the-wire format.  Any similarities are coincidetial ;) */
 
 /* Copyright (C) 2019  Harald Welte <laforge@gnumonks.org>
diff --git a/src/gsm/cbsp.c b/src/gsm/cbsp.c
index ccc2df5..b89358d 100644
--- a/src/gsm/cbsp.c
+++ b/src/gsm/cbsp.c
@@ -1,3 +1,4 @@
+/* Cell Broadcast Service Protocol (CBSP, 3GPP TS 48.049): Message encoding, decoding and reception */
 /*
  * Copyright (C) 2019  Harald Welte <laforge@gnumonks.org>
  *