clarify licence

diff --git a/COPYING b/COPYING
index 294b73f77b5284e34fabb74826f266e772e1ac27..8b01e53bb5e4ff19dc13b8ff508bd22652018a31 100644 (file)
--- a/COPYING
+++ b/COPYING
@@ -1,7 +1,9 @@
 In addition to the terms of the GNU General Public License, this licence also
 comes with the added permission that, if you become obligated to release a
 derived work under this licence (as per section 2.b), you may delay the
-fulfillment of this obligation for up to 12 months.
+fulfillment of this obligation for up to 12 months ("grace period").  You must 
+include this same added permission (the "grace period" clause) in the licence 
+under which your derived work is released.
 
 This licence also comes with the added permission that you may link this
 program with the OpenSSL library and distribute executables, as long as you