diff --git a/presentations/1hr-GPL/1hr-GPL.markdown b/presentations/1hr-GPL/1hr-GPL.markdown
index b137319..66b7b05 100644
--- a/presentations/1hr-GPL/1hr-GPL.markdown
+++ b/presentations/1hr-GPL/1hr-GPL.markdown
@@ -17,6 +17,7 @@
 # How These Orgs Relate to GPL?
 
 + FSF
+    + Invented copyleft.
     + Authors & stewards of the GPL.
     + Holder of copyrights on many key GNU programs …
     + … and therefore enforcers of those copyrights.