userguide: explain why Mod4 is usually preferred (#3018)

diff --git a/docs/userguide b/docs/userguide
index 5225c39149539342158c0774b93f54922419bc1d..697e241c30c56bc726a74cf5001078971e0f3958 100644 (file)
--- a/docs/userguide
+++ b/docs/userguide
@@ -35,7 +35,8 @@ above, just decline i3-config-wizard’s offer and base your config on
 
 Throughout this guide, the keyword +$mod+ will be used to refer to the
 configured modifier. This is the Alt key (+Mod1+) by default, with the Windows
-key (+Mod4+) being a popular alternative.
+key (+Mod4+) being a popular alternative that largely prevents conflicts with
+application-defined shortcuts.
 
 === Opening terminals and moving around