title: Is it possible to attach a message to a git commit that will display when pulled?
body: <p>I work in a large codebase with >100 developers pushing/merging to the same branch often, and occasionally people push up changes that require extra steps after pulled. In an ideal world, communication is a good solution, but in practice we all know that's not going to work 100% of the time.</p>
  
  <p>I'm looking for a git or github feature that allows us to either flag a commit or merge as needing extra steps, or somehow including a message that will be displayed when that commit is pulled.</p>
  
  <p>Commit messages are great, but it's not feasible to require every developer manually <code>git log</code> after every pull to see if they need to do something.</p>
  
  <p>For example, it would be great if I could add a message like "requires <code>npm install</code> after pull" to a commit in which I modify <code>package.json</code>, and when pulled the message is displayed.</p>
  
  <p><strong>EDIT (5/21/18)</strong></p>
  
  <p>See accepted answer for what I ended up doing. The <code>post-merge</code> hook solved the functionality I was looking for, and does not rely on the developer "marking" or "leaving a message" on their commit. </p>