Add description of libXext to README.md

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/README.md b/README.md
index cae5316..edb1b4d 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,9 @@
 libXext - library for common extensions to the X11 protocol
 -----------------------------------------------------------
 
+libXext is the historical libX11-based catchall library for the X11
+extensions without their own libraries.
+
 No new extensions should be added to this library - it is now instead
 preferred to make per-extension libraries that can be evolved as needed
 without breaking compatibility of this core library.