diff --git a/qt5-qtquickcontrols.spec b/qt5-qtquickcontrols.spec
index 12fefb8..8013fa4 100644
--- a/qt5-qtquickcontrols.spec
+++ b/qt5-qtquickcontrols.spec
@@ -63,6 +63,7 @@ make %{?_smp_mflags}
 
 %if 0%{?docs}
 # HACK to avoid multilib conflicts in noarch content
+# see also https://bugreports.qt-project.org/browse/QTBUG-42071
 QT_HASH_SEED=0; export QT_HASH_SEED
 make %{?_smp_mflags} docs
 %endif