diff --git a/tools/project.conf b/tools/project.conf
index d990b17..f87e543 100644
--- a/tools/project.conf
+++ b/tools/project.conf
@@ -2,6 +2,9 @@ targets=plug,snooper,xkey
 cflags_force=-W `pkg-config --cflags gtk+-2.0`
 cflags=-Wall -g -O2
 ldflags_force=`pkg-config --libs gtk+-2.0`
+#for Gtk+ 3
+#cflags_force=-W `pkg-config --cflags gtk+-3.0`
+#ldflags_force=`pkg-config --libs gtk+-3.0`
 dist=Makefile
 
 [plug]