diff --git a/h-m-m b/h-m-m
index 5997efa..723ed2c 100755
--- a/h-m-m
+++ b/h-m-m
@@ -948,6 +948,25 @@ function build_map(&$mm)
 }
 
 
+// }}}
+// {{{ toggle symbol
+
+function toggle_symbol(&$mm)
+{
+	$chr = mb_substr($mm['nodes'][ $mm['active_node'] ]['title'],0,2);
+	if ($chr=='✓ ')
+		$mm['nodes'][ $mm['active_node'] ]['title'] = '✗ '.mb_substr($mm['nodes'][ $mm['active_node'] ]['title'],2);
+	elseif ($chr=='✗ ')
+		$mm['nodes'][ $mm['active_node'] ]['title'] = mb_substr($mm['nodes'][ $mm['active_node'] ]['title'],2);
+	else
+		$mm['nodes'][ $mm['active_node'] ]['title'] = '✓ '.$mm['nodes'][ $mm['active_node'] ]['title'];
+
+	$mm['modified'] = true;
+	build_map($mm);
+	display($mm);
+}
+
+
 // }}}
 // {{{ toggle node
 
@@ -2709,6 +2728,8 @@ function monitor_key_presses(&$mm)
 			case 's':       save($mm); break;
 			case 'S':       save($mm, true); break;
 
+			case 't':       toggle_symbol($mm); break;
+
 			case 'u':       undo($mm); break;
 
 			case 'v':       collapse_all($mm); break;
diff --git a/readme.md b/readme.md
index 327065a..879341d 100644
--- a/readme.md
+++ b/readme.md
@@ -22,6 +22,7 @@ Adding, removing, and editing nodes:
 * `Ctrl+p` - appends the clipboard text at the end of the active node's title
 * `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
 * `u` - undo
 * `Ctrl+r` - redo