diff --git a/wsjtx.pro b/wsjtx.pro
index 76e59855f..9fc89ca8b 100644
--- a/wsjtx.pro
+++ b/wsjtx.pro
@@ -14,6 +14,7 @@ VERSION = 1.4
 TEMPLATE = app
 DEFINES = QT5
 QMAKE_CXXFLAGS += -std=c++11
+DEFINES += PROJECT_MANUAL="http://www.physics.princeton.edu/pulsar/K1JT/wsjtx-doc/wsjtx-main.html"
 
 isEmpty (DESTDIR) {
 DESTDIR = ../wsjtx_install