diff --git a/README.md b/README.md
index 8d6fc362..3818b128 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,95 @@
-# autoupdate-action
-A GitHub Action that auto-updates PRs with changes from their base branch.
+# autoupdate
+**autoupdate** is a GitHub Action that auto-updates pull requests branches whenever changes land on their destination branch.
 
-**Still in development and not ready for use yet**
+## Usage
+Put the 
+```yaml
+name: autoupdate
+on:
+  # This will trigger on all pushes to all branches.
+  push: {}
+  # Alternatively, you can only trigger if commits are pushed to certain branches, e.g.:
+  # push:
+  #   branches:
+  #     - master
+  #     - unstable
+
+jobs:
+  autoupdate:
+    name: autoupdate
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: docker://chinthakagodawita/autoupdate-action:v1
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+```
+
+This will trigger on all pushes and automatically update any pull requests, if changes are pushed to their destination branch.
+
+For more information on customising event triggers, see [Github's documentation](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/events-that-trigger-workflows#push-event-push).
+
+
+## Configuration
+The following configuration options are supported. To change any of these, simply specify it as an `env` value in your workflow file.
+
+All configuration values, except `GITHUB_TOKEN`, are optional.
+
+* `GITHUB_TOKEN`: _autoupdate_ uses this token to perform its operations on your repository. This should generally be set to `"${{ secrets.GITHUB_TOKEN }}"`.
+
+  You _may_ want to override this if you want the action to run as a different user than the default actions bot.
+
+* `DRY_RUN`: Enables 'dry run' mode, possible values are `"true"` or `"false"` (default).
+
+  In dry run mode, merge/update operations are logged to the console but not performed. This can be useful if you're testing this action or testing a particular configuration value.
+
+* `PR_FILTER`: Controls how _autoupdate_ chooses which pull requests to operate on. Possible values are:
+  * `"all"` (default): No filter, _autoupdate_ will monitor and update all pull requests.
+  * `"labelled"`: Only monitor PRs with a particular label (or set of labels). Requires the `PR_LABELS` option to be defined to. If `PR_LABELS` is not defined, _autoupdate_ will not monitor any pull requests.
+  * `"protected"`: Only monitor PRs that are raised against [protected branches](https://help.github.com/en/github/administering-a-repository/about-protected-branches).
+
+* `PR_LABELS`: Controls which labels _autoupdate_ will look for when monitoring PRs. Only used if `PR_FILTER="labelled"`. This can be either a single label or a comma-separated list of labels.
+
+* `MERGE_MSG`: A custom message to use when creating the merge commit from the destination branch to your pull request's branch.
+
+* `RETRY_COUNT`: The number of times a branch update should be attempted before _autoupdate_ gives up (default: `"5"`).
+
+* `RETRY_SLEEP`: The amount of time (in milliseconds) that _autoupdate_ should wait between branch update attempts (default: `"300"`).
+
+Here's an example workflow file with all of the above options specified:
+
+```yaml
+name: autoupdate
+on:
+  push: {}
+
+jobs:
+  autoupdate:
+    name: autoupdate
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: docker://chinthakagodawita/autoupdate-action:v1
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          DRY_RUN: "false"
+          PR_FILTER: "labelled"
+          PR_LABELS: "autoupdate,keep up-to-date,integration"
+          MERGE_MSG: "Branch was auto-updated."
+          RETRY_COUNT: "5"
+          RETRY_SLEEP: "300"
+```
+
+## Limitations
+* Branch updates events caused by this action will not trigger any subsequent workflows
+  * [This is a documented limitation](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/events-that-trigger-workflows#about-workflow-events) for all GH actions:
+  > An action in a workflow run can't trigger a new workflow run. For example, if an action pushes code using the repository's GITHUB_TOKEN, a new workflow will not run even when the repository contains a workflow configured to run when push events occur.
+  * There is [an open issue in the Github community forum](https://github.community/t5/GitHub-Actions/Triggering-a-new-workflow-from-another-workflow/td-p/31676) tracking this
+
+## Coming soon
+* Conflict handling
+* Rebase support
+* Label negation support
+* Token support in custom merge messages
+
+## Also see
+* [automerge](https://github.com/pascalgn/automerge-action/) for automatic merging of PRs
+* [autosquash](https://github.com/tibdex/autosquash) for auto-merging with squash support
diff --git a/src/autoupdater.js b/src/autoupdater.js
index c4449031..45c18ef4 100644
--- a/src/autoupdater.js
+++ b/src/autoupdater.js
@@ -99,6 +99,7 @@ class AutoUpdater {
       base: headRef,
       head: baseRef,
     };
+
     if (mergeMsg !== null && mergeMsg.length > 0) {
       mergeOpts.commit_message = mergeMsg;
     }