diff --git a/python-qt5.spec b/python-qt5.spec
index 4acc284..36e1ea0 100644
--- a/python-qt5.spec
+++ b/python-qt5.spec
@@ -246,6 +246,8 @@ Requires:  python%{python3_pkgversion}-qt5%{?_isa} = %{version}-%{release}
 
 
 %build
+## see also https://www.riverbankcomputing.com/static/Docs/PyQt5/installation.html
+
 PATH=%{_qt5_bindir}:$PATH ; export PATH
 
 # Python 2 build: