--- a/README.md	Fri May 12 11:09:36 2017 -0700
+++ b/README.md	Fri May 12 16:17:41 2017 -0700
@@ -25,7 +25,7 @@
 *Strong recommendation*: Create your lists with archiving (-a) and
 indexing (-i)!   This library is suitable for modifying behavior of
 existing lists as a default, but with these flags enabled, can also
-be an interface to parsing and browsing the content of lists.
+be a generic interface for parsing and browsing list content.
 
 
 ## Prerequisites
@@ -67,6 +67,18 @@
 of miscellaneous things included.
 
 
+## Acknowledgments
+
+Portions of this library are copied from ezmlm-idx source, authored by
+the following:
+
+ * D. J. Bernstein <djb@cr.yp.to>
+ * Bruce Guenter <bruce@untroubled.org>
+
+Many thanks for Dan and Bruce for their commitment for fine software, and
+contributions to the internet communities over the years.
+
+
 ## License
 
 Copyright (c) 2017, Mahlon E. Smith <mahlon@martini.nu>