diff --git a/geo/gpstk/Makefile b/geo/gpstk/Makefile
index 4fbafb36ce9..14c21474dad 100644
--- a/geo/gpstk/Makefile
+++ b/geo/gpstk/Makefile
@@ -1,3 +1,5 @@
+# should be replaced with https://github.com/sgl-ut/gnsstk and https://github.com/sgl-ut/gnsstk-apps
+# GH_PROJECT=gnsstk
 COMMENT=		GPS processing toolkit
 
 V=			2.10