add comment where preduce.py comes from

diff --git a/openpower/sv/test_preduce.py b/openpower/sv/test_preduce.py
index d5148428cae2f2805aa1a9f3251ef64b9e21330b..60770f6b558548db8ba44c6e893ecd94c5627c33 100644 (file)
--- a/openpower/sv/test_preduce.py
+++ b/openpower/sv/test_preduce.py
@@ -1,3 +1,5 @@
+# source code of yield-based parallel reduction schedule:
+# https://git.libre-soc.org/?p=libreriscv.git;a=blob;f=openpower/sv/preduce.py;hb=HEAD
 from preduce import preduce_y
 from copy import copy