diff --git a/cameo/templates/mkmk-simple b/cameo/templates/mkmk-simple
index 2d73b13..682bc86 100755
--- a/cameo/templates/mkmk-simple
+++ b/cameo/templates/mkmk-simple
@@ -16,6 +16,7 @@ PATH=$PATH:/home/qi/cae-tools/gp2rml
 # BOARD_Z	board tickness, default: 0.8 mm
 # ANY		set to "any" to use all remaining paths for milling,
 #		irrespective of tool size. Default: unset / empty string.
+# CLEARANCE	tool clearance above PCB surface, default: 2mm
 #
 
 while [ "$1" ]; do
@@ -34,6 +35,7 @@ fi
 : ${MILL_IN:=35mil}
 : ${MILL_OUT:=35mil}
 : ${BOARD_Z:=0.8mm}
+: ${CLEARANCE:=2mm}
 
 rot=
 if [ "$ROT" ]; then
@@ -83,8 +85,8 @@ EOF
     yi=`expr $yi + 1`
 done
 
-gp2rml 2 0.5 0.5 mill.gp >mill.rml
-gp2rml 2 0.1 0.5 drill.gp >drill.rml
+gp2rml $CLEARANCE 0.5 0.5 mill.gp >mill.rml
+gp2rml $CLEARANCE 0.1 0.5 drill.gp >drill.rml
 
 
 cat <<EOF >Makefile.mkmk