diff --git a/nixos/modules/services/misc/gitolite.nix b/nixos/modules/services/misc/gitolite.nix
index 66e19d13d72..16335c8aca7 100644
--- a/nixos/modules/services/misc/gitolite.nix
+++ b/nixos/modules/services/misc/gitolite.nix
@@ -36,6 +36,7 @@ in
           Initial administrative public key for Gitolite. This should
           be an SSH Public Key. Note that this key will only be used
           once, upon the first initialization of the Gitolite user.
+          The key string cannot have any line breaks in it.
         '';
       };