diff --git a/copyparty/web/md.css b/copyparty/web/md.css
index 39a9b1d7..495de5a7 100644
--- a/copyparty/web/md.css
+++ b/copyparty/web/md.css
@@ -212,6 +212,10 @@ blink {
 	#toolsbox a+a {
 		text-decoration: none;
 	}
+	#lno {
+		position: absolute;
+		right: 0;
+	}
 
 
 
diff --git a/copyparty/web/md.html b/copyparty/web/md.html
index e38c069d..a4b482bf 100644
--- a/copyparty/web/md.html
+++ b/copyparty/web/md.html
@@ -26,6 +26,7 @@
 				<a id="cfg_uni" href="#">non-ascii: whitelist</a>
 				<a id="help" href="#">help</a>
 			</div>
+			<span id="lno">L#</span>
 		{%- else %}
 			<a href="?edit" tt="good: higher performance$Ngood: same document width as viewer$Nbad: assumes you know markdown">edit (basic)</a>
 			<a href="?edit2" tt="not in-house so probably less buggy">edit (fancy)</a>
diff --git a/copyparty/web/md2.js b/copyparty/web/md2.js
index 42f22553..899f0022 100644
--- a/copyparty/web/md2.js
+++ b/copyparty/web/md2.js
@@ -875,6 +875,40 @@ function cfg_uni(e) {
 }
 
 
+var set_lno = (function () {
+    var t = null,
+        pi = null,
+        pv = null,
+        lno = ebi('lno');
+
+    function poke() {
+        clearTimeout(t);
+        t = setTimeout(fire, 20);
+    }
+
+    function fire() {
+        try {
+            clearTimeout(t);
+
+            var i = dom_src.selectionStart;
+            if (i === pi)
+                return;
+
+            var v = 'L' + dom_src.value.slice(0, i).split('\n').length;
+            if (v != pv)
+                lno.innerHTML = v;
+
+            pi = i;
+            pv = v;
+        }
+        catch (e) { }
+    }
+
+    timer.add(fire);
+    return poke;
+})();
+
+
 // hotkeys / toolbar
 (function () {
     function keydown(ev) {
@@ -893,6 +927,8 @@ function cfg_uni(e) {
         if (document.activeElement != dom_src)
             return true;
 
+        set_lno();
+
         if (ctrl(ev)) {
             if (ev.code == "KeyH" || kc == 72) {
                 md_header(ev.shiftKey);
diff --git a/docs/notes.sh b/docs/notes.sh
index a4063842..aa3df7c2 100644
--- a/docs/notes.sh
+++ b/docs/notes.sh
@@ -79,10 +79,8 @@ command -v gdate && date() { gdate "$@"; }; while true; do t=$(date +%s.%N); (ti
 # get all up2k search result URLs
 var t=[]; var b=document.location.href.split('#')[0].slice(0, -1); document.querySelectorAll('#u2tab .prog a').forEach((x) => {t.push(b+encodeURI(x.getAttribute("href")))}); console.log(t.join("\n"));
 
-# rename all selected songs to <leading-track-number> + <Title> + <extension>
-var sel=msel.getsel(), ci=find_file_col('Title')[0], re=[]; for (var a=0; a<sel.length; a++) { var url=sel[a].vp, tag=ebi(sel[a].id).closest('tr').querySelectorAll('td')[ci].textContent, name=uricom_dec(vsplit(url)[1])[0], m=/^([0-9]+[\. -]+)?.*(\.[^\.]+$)/.exec(name), name2=(m[1]||'')+tag+m[2], url2=vsplit(url)[0]+uricom_enc(name2,false); if (url!=url2) re.push([url, url2]); }
-console.log(JSON.stringify(re, null, '  '));
-function f() { if (!re.length) return treectl.goto(get_evpath()); var [u1,u2] = re.shift(); fetch(u1+'?move='+u2).then((rsp) => {if (rsp.ok) f(); }); }; f();
+# debug md-editor line tracking
+var s=mknod('style');s.innerHTML='*[data-ln]:before {content:attr(data-ln)!important;color:#f0c;background:#000;position:absolute;left:-1.5em;font-size:1rem}';document.head.appendChild(s);
 
 ##
 ## bash oneliners
diff --git a/srv/test.md b/srv/test.md
index 7338b982..05affa33 100644
--- a/srv/test.md
+++ b/srv/test.md
@@ -1,11 +1,17 @@
 ### hello world
 
 * qwe
-* asd
-  * zxc
-  * 573
-    * one
-    * two
+* rty
+* uio
+  * asd
+  * fgh
+  * jkl
+    * zxc
+    * vbn
+    * 573
+      * one
+      * two
+      * three
     
   * |||
     |--|--|