diff --git a/rubygem-public_suffix.spec b/rubygem-public_suffix.spec
index fca84ab..c1a69b4 100644
--- a/rubygem-public_suffix.spec
+++ b/rubygem-public_suffix.spec
@@ -23,6 +23,7 @@ domain and subdomains.
 
 %package doc
 Summary: Documentation for %{name}
+# Public Domain: %%{gem_instdir}/test/tests.txt
 License: MIT or Public Domain
 Requires: %{name} = %{version}-%{release}
 BuildArch: noarch