diff --git a/pearson.c b/pearson.c
index 2ec74bd..ca2aa3e 100644
--- a/pearson.c
+++ b/pearson.c
@@ -1,3 +1,5 @@
+// taken from https://github.com/Logan007/pearson
+
 #include <stddef.h>
 #include <stdint.h>