From ea744d4cf8ffcf03cb3b2e4e1ac974fd582a868f Mon Sep 17 00:00:00 2001
From: Phil de Joux <philderbeast@gmail.com>
Date: Sun, 2 Sep 2018 18:53:33 -0400
Subject: [PATCH] Mark repository revision as required, fixes #26.

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index b52a4f38c..1f8f79d62 100644
--- a/README.md
+++ b/README.md
@@ -69,7 +69,7 @@ nixpkgs_git_repository(name, revision, sha256)
     <tr>
       <td><code>revision</code></td>
       <td>
-        <p><code>String; optional</code></p>
+        <p><code>String; required</code></p>
         <p>Git commit hash or tag identifying the version of Nixpkgs
            to use.</p>
       </td>