diff --git a/src/kiri-mode/cam/client.js b/src/kiri-mode/cam/client.js
index 94cde2a8..c16a4df1 100644
--- a/src/kiri-mode/cam/client.js
+++ b/src/kiri-mode/cam/client.js
@@ -472,14 +472,15 @@ CAM.init = function(kiri, api) {
         let scale = API.view.unit_scale();
         let notime = false;
         oplist.forEach((rec,i) => {
+            let title = '';
             let clock = rec.type === '|';
             let label = clock ? `` : rec.type;
             let clazz = notime ? [ "draggable", "notime" ] : [ "draggable" ];
             let notable = rec.note?.split(' ').filter(v => v.charAt(0) === '#');
-            if (clock) clazz.push('clock');
+            if (clock) { clazz.push('clock'); title = ` title="end of ops chain\ndrag/drop like an op\nops after this are disabled"` }
             if (notable?.length) label = notable[0].slice(1);
             html.appendAll([
-                `<div id="${mark+i}" class="${clazz.join(' ')}">`,
+                `<div id="${mark+i}" class="${clazz.join(' ')}"${title}>`,
                 `<label class="label">${label}</label>`,
                 clock ? '' :
                 `<label id="${mark+i}-x" class="del"><i class="fa fa-trash"></i></label>`,