diff --git a/Doc/lib/libzipfile.tex b/Doc/lib/libzipfile.tex
index 0b1d43d..f29c47f 100644
--- a/Doc/lib/libzipfile.tex
+++ b/Doc/lib/libzipfile.tex
@@ -6,6 +6,8 @@
 \sectionauthor{James C. Ahlstrom}{jim@interet.com}
 % LaTeX markup by Fred L. Drake, Jr. <fdrake@acm.org>
 
+\versionadded{1.6}
+
 The ZIP file format is a common archive and compression standard.
 This module provides tools to create, read, write, append, and list a
 ZIP file.