diff --git a/lib/datasource/docker/index.js b/lib/datasource/docker/index.js
index 564a826d53a7815fcf80247213ff71b22f003c00..2ad44ea6b9ce70071b0bb606d9d909bec5a24373 100644
--- a/lib/datasource/docker/index.js
+++ b/lib/datasource/docker/index.js
@@ -349,6 +349,10 @@ async function getPkgReleases({ lookupName, registryUrls }) {
     return null;
   }
   const releases = tags.map(version => ({ version }));
-  const ret = { releases };
+  const ret = {
+    dockerRegistry: registry,
+    dockerRepository: repository,
+    releases,
+  };
   return ret;
 }