diff --git a/debian/patches/remove_git_in_gemspec.patch b/debian/patches/remove_git_in_gemspec.patch
index a05a5f1301ae9471e415e9226df4d509c6cbaaab..c1e03e286bfb8a48233d61b6a282576d152b2cd4 100644
--- a/debian/patches/remove_git_in_gemspec.patch
+++ b/debian/patches/remove_git_in_gemspec.patch
@@ -1,3 +1,5 @@
+Debian package source tree is not a git repo.
+
 --- a/rspec-rails.gemspec
 +++ b/rspec-rails.gemspec
 @@ -21,7 +21,7 @@