Add a pointer to OpenPrinting CUPS and clarify that Apple CUPS is what is shipped...

diff --git a/README.md b/README.md
index c97cf25972100e052ba2dc0141cbf92c66c0148b..a470ecd06fa982ce9356af649438156a64f0481b 100644 (file)
--- a/README.md
+++ b/README.md
@@ -1,5 +1,10 @@
-README - CUPS v2.3.5 - 2021-04-26
-=================================
+README - Apple CUPS v2.3.5 - 2021-09-13
+=======================================
+
+> Note: Apple CUPS is the version of CUPS that is shipped with macOS and iOS.
+> For the current version of CUPS that is used on other operating systems, see
+> <https://openprinting.github.io/cups> for details.
+
 
 INTRODUCTION
 ------------