diff --git a/ostat.go b/ostat.go
index 6020fcc..32ba9be 100644
--- a/ostat.go
+++ b/ostat.go
@@ -1,3 +1,6 @@
+// ostat is a go package that implements the efficient, accurate, and stable
+// calculation of online] statistical quantities. The algorithm comes from *The
+// Art of Computer Programing*, vol 2 by Knuth
 package ostat
 
 import (