diff --git a/CMakeLists.txt b/CMakeLists.txt
index bb7018428..a274d049f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,7 +53,7 @@ set (PROJECT_CONTACT "Joe Taylor <k1jt@arrl.net>")
 set (PROJECT_COPYRIGHT "Copyright (C) 2001-2015 by Joe Taylor, K1JT")
 set (PROJECT_HOMEPAGE http://www.physics.princeton.edu/pulsar/K1JT/wsjtx.html)
 set (PROJECT_MANUAL wsjtx-main)
-set (PROJECT_MANUAL_DIRECTORY_URL http://www.physics.princeton.edu/pulsar/K1JT/wsjtx-doc)
+set (PROJECT_MANUAL_DIRECTORY_URL http://www.physics.princeton.edu/pulsar/K1JT/wsjtx-doc/)
 set (PROJECT_SAMPLES_URL http://downloads.sourceforge.net/project/wsjt/)
 set (PROJECT_SAMPLES_UPLOAD_DEST frs.sourceforge.net:/home/frs/project/wsjt/)
 set (PROJECT_SUMMARY_DESCRIPTION "${PROJECT_NAME} - JT9 and JT65 Modes for LF, MF and HF Amateur Radio.")