diff --git a/gutenprint.spec b/gutenprint.spec
index 4c258c1..e4c9c46 100644
--- a/gutenprint.spec
+++ b/gutenprint.spec
@@ -17,7 +17,8 @@
 %bcond_with gtk2
 %endif
 
-# added in cups-1:2.4.7-3
+# added in cups-1:2.4.7-3 - remove once F40 is EOL and C10S is released
+# (that's the safe bet for versions where macros will be always available)
 %{!?_cups_datadir:%global _cups_datadir %(/usr/bin/pkg-config --variable=cups_datadir cups)}
 %{!?_cups_serverroot:%global _cups_serverroot %(/usr/bin/pkg-config --variable=cups_serverroot cups)}