diff --git a/h-m-m b/h-m-m
index 3d60c21..ddffff9 100755
--- a/h-m-m
+++ b/h-m-m
@@ -953,6 +953,34 @@ function build_map(&$mm)
 }
 
 
+// }}}
+// {{{ toggle numbers
+
+function toggle_numbers(&$mm)
+{
+	if ($mm['active_node'] <= $mm['root'])
+		return;
+
+	$ordered= false;
+	$i=1;
+	foreach ($mm['nodes'][ $mm['nodes'][$mm['active_node']]['parent'] ]['children'] as $cid)
+		$ordered = $ordered || mb_ereg('^\d+\.',$mm['nodes'][$cid]['title']);
+
+	$i=1;
+	foreach ($mm['nodes'][ $mm['nodes'][$mm['active_node']]['parent'] ]['children'] as $cid)
+		if ($ordered)
+			$mm['nodes'][$cid]['title'] = mb_ereg_replace('^\d+\. *','',$mm['nodes'][$cid]['title']);
+		else
+			$mm['nodes'][$cid]['title'] = ($i++).'. '.$mm['nodes'][$cid]['title'];
+
+	$mm['modified'] = true;
+	build_map($mm);
+	display($mm);
+}
+
+
+
+
 // }}}
 // {{{ toggle symbol
 
@@ -2734,6 +2762,7 @@ function monitor_key_presses(&$mm)
 			case 'S':       save($mm, true); break;
 
 			case 't':       toggle_symbol($mm); break;
+			case '#':       toggle_numbers($mm); break;
 
 			case 'u':       undo($mm); break;
 
diff --git a/readme.md b/readme.md
index 879341d..c422680 100644
--- a/readme.md
+++ b/readme.md
@@ -23,6 +23,7 @@ Adding, removing, and editing nodes:
 * `e`, `i`, or `a` - edits the active node
 * `E`, `I`, or `A` - edits the active node, ignoring the existing text
 * `t` - toggles '✓ ', '✗ ', and '' at the beginning of the title
+* `#` - adds or removes sequential numbers at the beginning of the titles of a node and its siblings
 * `u` - undo
 * `Ctrl+r` - redo