diff --git a/docs/configuration.md b/docs/configuration.md
index 02671ab09fae046d9271f2de06706217b9062eed..5df4725291273e6bbc7a460c70b3700eb2c3fd33 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -532,7 +532,11 @@ Obviously, you can't set repository or package file location with this method.
   "automerge": true,
   "unpublishSafe": false,
   "groupName": "Pin Dependencies",
-  "group": {"prTitle": "{{groupName}}", "semanticPrefix": "refactor(deps):"}
+  "group": {
+    "commitMessage": "Pin Dependencies",
+    "prTitle": "{{groupName}}",
+    "semanticPrefix": "refactor(deps):"
+  }
 }</pre></td>
   <td>`RENOVATE_PIN`</td>
   <td><td>
diff --git a/lib/config/definitions.js b/lib/config/definitions.js
index 5e1f5c83460704d8c5b967b35f6ae97147c6fd9e..9aa0880ef46b05e21de456429144c49dd0e9dc77 100644
--- a/lib/config/definitions.js
+++ b/lib/config/definitions.js
@@ -389,6 +389,7 @@ const options = [
       unpublishSafe: false,
       groupName: 'Pin Dependencies',
       group: {
+        commitMessage: 'Pin Dependencies',
         prTitle: '{{groupName}}',
         semanticPrefix: 'refactor(deps):',
       },
diff --git a/test/workers/package/__snapshots__/index.spec.js.snap b/test/workers/package/__snapshots__/index.spec.js.snap
index e40d59f690b7b14fbc93b34769f4bcb82c9513e8..7aa7ea66a5db58ffc61d6dbaf1cb199757b047d2 100644
--- a/test/workers/package/__snapshots__/index.spec.js.snap
+++ b/test/workers/package/__snapshots__/index.spec.js.snap
@@ -14,7 +14,7 @@ Object {
   "description": Array [],
   "group": Object {
     "branchName": "{{branchPrefix}}{{groupSlug}}",
-    "commitMessage": "Renovate {{groupName}} packages",
+    "commitMessage": "Pin Dependencies",
     "prBody": "This {{#if isGitHub}}Pull{{else}}Merge{{/if}} Request renovates the package group \\"{{groupName}}\\".
 
 {{#if schedule}}