diff --git a/qt-mobility.spec b/qt-mobility.spec
index 9778a3d..1938e2b 100644
--- a/qt-mobility.spec
+++ b/qt-mobility.spec
@@ -161,6 +161,7 @@ Requires: %{name}-common%{?_isa} = %{version}-%{release}
 Summary: QtLocation support
 Requires: %{name}-common%{?_isa} = %{version}-%{release}
 # workaround bug in postinstaller google-earth packaging
+# https://sourceforge.net/p/postinstaller/discussion/general/thread/22ddc07f
 Requires: proj%{?_isa}
 %description location
 %{summary}.