add link to decode1.vhdl

diff --git a/openpower/README.txt b/openpower/README.txt
index 4fc122ee0a4b78b9c431ec59fac6356aa1bb996f..3efad9bca332c9ed63cafac8ecfb88f5a281b888 100644 (file)
--- a/openpower/README.txt
+++ b/openpower/README.txt
@@ -3,6 +3,7 @@ The files in this directory have come from many locations:
 
 * isatables CSV files are from Microwatt decode1.vhdl which is
   CC 4.0 Copyrighted
+  https://github.com/antonblanchard/microwatt/blob/master/decode1.vhdl
 * isatables fields.txt is from the OpenPOWER v3.0B specification which
   is managed by the OpenPOWER Foundation
 * isa markdown files are extracted from the OpenPOWER v3.0B specification which