diff --git a/vpn-daemons/openvpn/src/nm-openvpn-service.h b/vpn-daemons/openvpn/src/nm-openvpn-service.h
index 4a2378e8ce..82158b509a 100644
--- a/vpn-daemons/openvpn/src/nm-openvpn-service.h
+++ b/vpn-daemons/openvpn/src/nm-openvpn-service.h
@@ -58,6 +58,9 @@
 
 #define NM_OPENVPN_KEY_PASSWORD "password"
 #define NM_OPENVPN_KEY_CERTPASS "cert-pass"
+/* Internal auth-dialog -> service token indicating that no secrets are
+ * required for the connection.
+ */
 #define NM_OPENVPN_KEY_NOSECRET "no-secret"
 
 #define NM_OPENVPN_CONTYPE_TLS          "tls"