diff --git a/lib/plugins/grafana/send-annotation.js b/lib/plugins/grafana/send-annotation.js
index 17ce6f896..015e0ad19 100644
--- a/lib/plugins/grafana/send-annotation.js
+++ b/lib/plugins/grafana/send-annotation.js
@@ -77,6 +77,7 @@ module.exports = {
     };
     // If Grafana is behind auth, use it!
     if (options.grafana.auth) {
+      log.debug('Using auth for Grafana');
       postOptions.headers.Authorization = 'Bearer ' + options.grafana.auth;
     }
     log.verbose('Send annotation to Grafana: %j', postData);
@@ -88,7 +89,13 @@ module.exports = {
           const e = new Error(
             `Got ${res.statusCode} from Grafana when sending annotation`
           );
-          log.warn(e.message);
+          if (res.statusCode === 403) {
+            log.warn('Authentication required.', e.message)
+          } else if (res.statusCode === 401) {
+            log.warn('No valid authentication.', e.message)
+          } else {
+            log.warn(e.message);
+          }
           reject(e);
         } else {
           res.setEncoding('utf8');