diff --git a/gpl-lgpl.tex b/gpl-lgpl.tex
index ec0d8ffd75691073ddefb4b9ece7c4ae5d1da583..2dd3ff9f13f19fab6306518d46f2be9d132dd223 100644
--- a/gpl-lgpl.tex
+++ b/gpl-lgpl.tex
@@ -137,7 +137,9 @@ prerequisite to make use of the freedom to modify.  However, the important
 issue is what freedoms are granted in the license that applies to that source code.
 
 Software freedom is only complete when no restrictions are imposed on how
-these freedoms are exercised.  Specifically, users and programmers can
+these freedoms are exercised, other than certain conditions customarily
+considered compatible with software freedom (such as copyleft requirements
+designed to maximize software freedom for the greater number of users).  Specifically, users and programmers can
 exercise these freedoms noncommercially or commercially.  Licenses that grant
 these freedoms for noncommercial activities but prohibit them for commercial
 activities are considered non-free.  The Open Source Initiative
