diff --git a/README.md b/README.md
index 94ebda9..12d3c94 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
 # cm5024z
 
-communication with CM5024 PV Controller
\ No newline at end of file
+communication with CM5024 PV Controller
+
+# credit
+
+based on code from Jindrich Nikles (http://www.jindrichnikles.cz/?p=91)