diff --git a/README.md b/README.md
index 2c5603f..61c4e6e 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,10 @@ This stores a file mtime, a size, and a cryptographically secure content checksu
 in an xattr, so that you can verify that your files aren't corrupted
 on filesystems that are dumb and don't include data checksums (e.g. apfs)
 
+# inspired by 
+
+* https://github.com/rfjakob/cshatag
+
 # background
 
 You can dd a few random bytes into the middle of an hfs+ or apfs filesystem,