diff --git a/README.md b/README.md
index 9bc53ff..4f856ad 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,7 @@ jobs:
       with:
         args: "https://gitlab.com/<namespace>/<repository>"
       env:
+        FORCE_PUSH: "false"
         GITLAB_HOSTNAME: "gitlab.com"
         GITLAB_USERNAME: "svboxel"
         GITLAB_PASSWORD: ${{ secrets.GITLAB_PASSWORD }} // Generate here: https://gitlab.com/profile/personal_access_tokens
@@ -34,3 +35,5 @@ Be sure to define the `GITLAB_PASSWORD` secret in `https://github.com/<namespace
 Before setup a token to use as `GITLAB_PASSWORD` here https://gitlab.com/profile/personal_access_tokens  
 The token must have `read_api`, `read_repository` & `write_repository` permissions in GitLab.  
 For granular permissions create seperate users and tokens in GitLab with restricted access.  
+
+If you're rewriting history in the primary repo (e.g by using `git rebase`), you'll need to force push. Set the `FORCE_PUSH` environment variable to `true` to enable this. This will overwrite history in the mirror as well, so be **careful with this** (just like any time you're using `git push --force`).
diff --git a/entrypoint.sh b/entrypoint.sh
index ca8d174..07ff4e7 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -31,7 +31,12 @@ sh -c "git config --global core.askPass /cred-helper.sh"
 sh -c "git config --global credential.helper cache"
 sh -c "git remote add mirror $*"
 sh -c "echo pushing to $branch branch at $(git remote get-url --push mirror)"
-sh -c "git push mirror $branch"
+if [ "$FORCE_PUSH" = "true" ]
+then
+  sh -c "git push --force mirror $branch"
+else
+  sh -c "git push mirror $branch"
+fi
 
 sleep $POLL_TIMEOUT