diff --git a/extract-docker-images.js b/extract-docker-images.js
index d37e01db..87b142be 100644
--- a/extract-docker-images.js
+++ b/extract-docker-images.js
@@ -14,14 +14,12 @@ module.exports = function extractDockerImages(fileContent) {
 
       // Resolve anchors/merges if image is not directly present
       if (!image && serviceDef['<<']) {
-        const merge = serviceDef['<<'];
-        if (Array.isArray(merge)) {
-          merge.forEach(m => {
-            if (m.image) image = m.image;
-          });
-        } else if (merge.image) {
-          image = merge.image;
-        }
+        const merge = Array.isArray(serviceDef['<<']) ? serviceDef['<<'] : [serviceDef['<<']];
+        merge.forEach(m => {
+          if (m && m.image && !image) {
+            image = m.image;
+          }
+        });
       }
 
       if (image) {
@@ -29,7 +27,7 @@ module.exports = function extractDockerImages(fileContent) {
         result.push({
           depName: depName,
           currentValue: currentValue || 'latest',
-          service: serviceName // <- added for Renovate PR title
+          service: serviceName // For Renovate PR titles
         });
       }
     }
diff --git a/renovate.json b/renovate.json
index cf4777b9..c1611246 100644
--- a/renovate.json
+++ b/renovate.json
@@ -26,10 +26,6 @@
       "matchDatasources": ["docker"],
       "matchPackagePatterns": ["^.*:latest$"],
       "enabled": false
-    },
-    {
-      "matchDatasources": ["docker"],
-      "description": "Docker image used by service {{service}} ({{depName}})"
     }
   ],
 
@@ -49,9 +45,7 @@
 
   "branchNameStrict": true,
   "branchPrefix": "renovate/",
-  "branchName": "{{service}}/{{depName}}-{{newVersion}}",
-
+  "branchTopic": "{{service}}/{{depName}}",
   "commitMessageAction": "Update",
-  "commitMessageTopic": "{{service}}/{{depName}}",
-  "commitMessageExtra": "{{currentValue}} → {{newVersion}}"
+  "commitMessageTopic": "{{service}}/{{depName}}"
 }