diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 1f54574c..67fbb528 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -39,8 +39,8 @@ jobs:
       - name: Prepare diff for AI summary
         if: steps.changes.outputs.changed == 'true'
         run: |
-          git diff --stat > /tmp/diff_stat.txt
-          git diff | head -c 20000 > /tmp/diff.txt
+          git diff --stat | sed 's/^/      /' > /tmp/diff_stat.txt
+          git diff | head -c 20000 | sed 's/^/      /' > /tmp/diff.txt
       - name: Generate commit message with AI
         if: steps.changes.outputs.changed == 'true'
         id: ai
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 73f36a42..940a0159 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ Changelog
 Some notable infrastructure contributions below. See [commits](commits/master) for Slack API updates.
 
 * Your contribution here.
+* [#88](https://github.com/slack-ruby/slack-api-ref/pull/88): Fix a YAML indentation bug in AI commit message generation - [@dblock](https://github.com/dblock).
 * [#87](https://github.com/slack-ruby/slack-api-ref/pull/87): Generate AI commit summaries for automated API updates - [@dblock](https://github.com/dblock).
 * [#64](https://github.com/slack-ruby/slack-api-ref/pull/64): Add `arg_groups` for groups of arguments whose requirement is interdependent - [@jmanian](https://github.com/jmanian).
 * [#64](https://github.com/slack-ruby/slack-api-ref/pull/64): Add `"format": "json"` attribute for arguments that need to be JSON strings - [@jmanian](https://github.com/jmanian).