diff --git a/.github/workflows/generate-readme.yml b/.github/workflows/generate-readme.yml
index d6f7710..3c6a06a 100644
--- a/.github/workflows/generate-readme.yml
+++ b/.github/workflows/generate-readme.yml
@@ -1,6 +1,12 @@
 name: Generate README from templates and data files using doctool
 on:
   workflow_call:
+    inputs:
+      doctool-ref:
+        description: 'Git ref (tag/branch/commit) of keyfactor/doctooldotnet to run. Defaults to main; override to pin to a specific commit/tag if needed.'
+        type: string
+        required: false
+        default: 'main'
     secrets:
       token:
         description: 'Secret token from caller workflow to approve readme'
@@ -23,6 +29,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: keyfactor/doctooldotnet
+          ref: ${{ inputs.doctool-ref }}
           path: doctooldotnet
           token: ${{ secrets.token }}
           clean: false