diff --git a/src/kiri-mode/cam/client.js b/src/kiri-mode/cam/client.js
index 1d035f8b..8cb0502b 100644
--- a/src/kiri-mode/cam/client.js
+++ b/src/kiri-mode/cam/client.js
@@ -976,7 +976,8 @@
             down:    'camDrillDown',
             rate:    'camDrillDownSpeed',
             dwell:   'camDrillDwell',
-            lift:    'camDrillLift'
+            lift:    'camDrillLift',
+            mark:    'camDrillMark'
         }).inputs = {
             tool:     UC.newSelect(LANG.cc_tool, {}, "tools"),
             sep:      UC.newBlank({class:"pop-sep"}),
@@ -984,7 +985,8 @@
             down:     UC.newInput(LANG.cc_sdwn_s, {title:LANG.cc_sdwn_l, convert:UC.toFloat, units:true}),
             rate:     UC.newInput(LANG.cc_plng_s, {title:LANG.cc_plng_l, convert:UC.toInt, units:true}),
             dwell:    UC.newInput(LANG.cd_dwll_s, {title:LANG.cd_dwll_l, convert:UC.toFloat}),
-            lift:     UC.newInput(LANG.cd_lift_s, {title:LANG.cd_lift_l, convert:UC.toFloat, units:true})
+            lift:     UC.newInput(LANG.cd_lift_s, {title:LANG.cd_lift_l, convert:UC.toFloat, units:true, show:() => !poppedRec.mark}),
+            mark:     UC.newBoolean(LANG.cd_mark_s, undefined, {title:LANG.cd_mark_l}),
         };
 
         createPopOp('register', {
diff --git a/src/kiri-mode/cam/ops.js b/src/kiri-mode/cam/ops.js
index d1481482..6c871f4e 100644
--- a/src/kiri-mode/cam/ops.js
+++ b/src/kiri-mode/cam/ops.js
@@ -924,7 +924,7 @@
                 drillToolDiam = drillTool.fluteDiameter(),
                 centerDiff = drillToolDiam * 0.1,
                 area = (drillToolDiam/2) * (drillToolDiam/2) * Math.PI,
-                areaDelta = area * 0.05,
+                areaDelta = op.mark ? Infinity : area * 0.05,
                 sliceOut = this.sliceOut = [];
 
             updateToolDiams(drillToolDiam);
@@ -961,6 +961,15 @@
             drills.forEach(function(drill) {
                 let center = drill.center(true),
                     slice = newSlice(0,null);
+                if (op.mark) {
+                    // replace points with single mark
+                    let points = drill.points;
+                    points = [
+                        points[0],
+                        points[0].clone().sub({x:0, y:0, z:op.down})
+                    ];
+                    drill.points = points;
+                }
                 drill.points.forEach(function(point) {
                     point.x = center.x;
                     point.y = center.y;
diff --git a/src/kiri/conf.js b/src/kiri/conf.js
index 76819f59..6d74ad6d 100644
--- a/src/kiri/conf.js
+++ b/src/kiri/conf.js
@@ -506,6 +506,7 @@
                     camDrillDown: 5,
                     camDrillDwell: 250,
                     camDrillLift: 2,
+                    camDrillMark: false,
                     camDrillingOn: false,
                     camRegisterSpeed: 1000,
                     camFlipAxis: "X",
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index 290f976a..c571f704 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -496,14 +496,16 @@ kiri.lang['en-us'] = {
     cd_menu:        "drill",
     cd_axis:        "axis",
     cd_points:      "points",
-    cd_plpr_s:      "plunge per",
-    cd_plpr_l:      ["max plunge between","dwell periods","in workspace units","0 to disable"],
+    // cd_plpr_s:      "plunge per",
+    // cd_plpr_l:      ["max plunge between","dwell periods","in workspace units","0 to disable"],
     cd_dwll_s:      "dwell time",
     cd_dwll_l:      ["dwell time","between plunges in","in milliseconds"],
     cd_lift_s:      "drill lift",
     cd_lift_l:      ["lift between plunges","after dwell period","in workspace units","0 to disable"],
     cd_regi_s:      "register",
     cd_regi_l:      ["drill registration holes","for double-sided parts","independent of enable","drilling but uses same","tool and settings"],
+    cd_mark_s:      "marking",
+    cd_mark_l:      ["only mark holes, do not drill out","the step down setting is used","to determine how deep to mark"],
 
     // CNC CUTOUT TABS
     ct_menu:        "tabs",