diff --git a/README.md b/README.md
index eeac746..ab89cfc 100644
--- a/README.md
+++ b/README.md
@@ -4,3 +4,6 @@ Internal use only, not intended for sale.
 
 No warranty.
 
+Sources here:
+
+https://github.com/pramsey/pgsql-gzip