diff --git a/src/include/lwip/prot/iana.h b/src/include/lwip/prot/iana.h
index c4274875..9c0a3a72 100644
--- a/src/include/lwip/prot/iana.h
+++ b/src/include/lwip/prot/iana.h
@@ -1,6 +1,6 @@
 /**
  * @file
- * IANA assigned numbers
+ * IANA assigned numbers (RFC 1700 and successors)
  */
 
 /*