diff --git a/librf625.pro b/librf625.pro
index 93316c69f4daf24e2087176198b4e1cfe6e3e3ca..33c5f5bb9a61dda2af7fde0b45f0790c3327d070 100644
--- a/librf625.pro
+++ b/librf625.pro
@@ -1,5 +1,8 @@
+# https://gitlab.com/riftek/dev/rf625/librf625
+
 QT       -= core gui
 
+# uncomment to build test binary
 #CONFIG += test
 
 DEFINES += RF625_LIBRARY
@@ -28,3 +31,5 @@ SOURCES += \
     src/rf625.cpp \
     src/sockfun.cpp \
     src/wshlp.cpp
+
+test: SOURCES += src/test.cpp