diff --git a/nts_ke_session.h b/nts_ke_session.h
index 49d95b4..f8e46f9 100644
--- a/nts_ke_session.h
+++ b/nts_ke_session.h
@@ -32,7 +32,7 @@
 
 typedef struct NKSN_Instance_Record *NKSN_Instance;
 
-/* Handler for received NTS-KE messages.  A non-zero return code stops
+/* Handler for received NTS-KE messages.  A zero return code stops
    the session. */
 typedef int (*NKSN_MessageHandler)(void *arg);