diff --git a/imgsrc/srv/heading.svg b/imgsrc/srv/heading.svg
new file mode 100644
index 0000000000..bc9ab6dd18
--- /dev/null
+++ b/imgsrc/srv/heading.svg
@@ -0,0 +1,5 @@
+<svg viewBox="0 0 128 128" height="128" width="128">
+  <g transform="translate(0,-924.36216)">
+    <path d="m 123.37397,1043.8196 q -3.32374,0 -10.00899,-0.2527 -6.68525,-0.2528 -10.08453,-0.2528 -3.323751,0 -9.971231,0.2528 -6.64748,0.2527 -9.97122,0.2527 -1.81295,0 -2.79496,-1.4803 -0.98202,-1.4803 -0.98202,-3.2856 0,-2.2385 1.28417,-3.3216 1.28418,-1.0832 2.94605,-1.2276 1.66187,-0.1445 3.85251,-0.5055 2.19065,-0.3611 3.39929,-1.0832 2.4928,-1.5164 2.4928,-10.1094 l -0.0755,-28.23417 q 0,-1.51638 -0.0755,-2.23849 -0.98201,-0.28888 -3.77698,-0.28888 h -50.9892 q -2.87051,0 -3.85252,0.28888 -0.0755,0.72211 -0.0755,2.23849 l -0.0755,26.78997 q 0,10.2539 2.79496,11.8425 1.20864,0.7221 3.6259,0.9387 2.41727,0.2166 4.30576,0.2528 1.88849,0.036 3.39928,1.0831 1.51079,1.0471 1.51079,3.2856 0,1.8775 -0.94425,3.466 -0.94424,1.5887 -2.75719,1.5887 -3.55036,0 -10.53777,-0.2527 -6.98741,-0.2528 -10.46223,-0.2528 -3.2482,0 -9.66907,0.2528 -6.4208594,0.2527 -9.5935194,0.2527 -1.73741,0 -2.68165,-1.5164 -0.94425,-1.5165 -0.94425,-3.2495 0,-2.1663 1.17086,-3.2494 1.17087,-1.0832 2.71943,-1.2637 1.54856,-0.1806 3.5881294,-0.5416 2.03957,-0.3611 3.17266,-1.0832 2.49281,-1.6608 2.49281,-10.326 l -0.0755,-4.116 v -58.70691 q 0,-0.21662 0.0378,-1.87744 0.0378,-1.66083 0,-2.63568 -0.0378,-0.97485 -0.11331,-2.78012 -0.0755,-1.80517 -0.26439,-3.03277 -0.18885,-1.2276 -0.49101,-2.63568 -0.30216,-1.40807 -0.83093,-2.27462 -0.52878,-0.86655 -1.20864,-1.29977 -1.13309,-0.72211 -3.3992793,-0.86655 -2.2661901,-0.14444 -4.0036001,-0.14444 -1.7374099,0 -3.0971199,-1.01089 -1.3597101,-1.01099 -1.3597101,-3.24948 0,-1.87744 0.9064701,-3.46609 0.90648,-1.58865 2.71943,-1.58865 3.47482,0 10.4622293,0.25274 6.98741,0.25275 10.46223,0.25275 3.17266,0 9.55576,-0.25275 6.38309,-0.25274 9.55575,-0.25274 1.88849,0 2.83273,1.58865 0.94425,1.58865 0.94425,3.46609 0,2.16632 -1.28417,3.14117 -1.28418,0.97476 -2.90828,1.04703 -1.6241,0.0717 -3.73921,0.28878 -2.1151,0.21671 -3.2482,0.93882 -2.64388,1.51638 -2.64388,11.5536 l 0.0755,23.1073 q 0,1.51639 0.0755,2.31067 0.98201,0.21661 2.94604,0.21661 h 52.80216 q 1.88849,0 2.8705,-0.21661 0.0755,-0.79428 0.0755,-2.31067 l 0.0755,-23.1073 q 0,-10.03722 -2.64388,-11.5536 -1.35972,-0.79438 -4.41907,-0.90268 -3.05935,-0.10831 -4.98561,-0.93872 -1.92626,-0.83041 -1.92626,-3.5744 0,-1.87744 0.94425,-3.46609 0.94424,-1.58865 2.83273,-1.58865 3.32374,0 9.97122,0.25274 6.64748,0.25275 9.971231,0.25275 3.2482,0 9.7446,-0.25275 6.4964,-0.25274 9.7446,-0.25274 1.88849,0 2.83274,1.58865 0.94424,1.58865 0.94424,3.46609 0,2.16632 -1.32194,3.17721 -1.32194,1.01099 -3.02158,1.04712 -1.69964,0.0363 -3.89029,0.21661 -2.19065,0.18048 -3.32374,0.90259 -2.64389,1.66082 -2.64389,11.62587 l 0.0755,68.09425 q 0,8.593 2.56835,10.1093 1.20863,0.7222 3.47482,0.9749 2.26619,0.2527 4.04137,0.325 1.77518,0.072 3.13489,1.1192 1.35971,1.047 1.35971,3.2134 0,1.8775 -0.90647,3.466 -0.90648,1.5887 -2.71943,1.5887 z" />
+  </g>
+</svg>
diff --git a/src/pyj/book_list/comments_editor.pyj b/src/pyj/book_list/comments_editor.pyj
index 98c687942b..21ee4d3e81 100644
--- a/src/pyj/book_list/comments_editor.pyj
+++ b/src/pyj/book_list/comments_editor.pyj
@@ -8,6 +8,8 @@ from gettext import gettext as _
 from book_list.theme import get_color
 from dom import add_extra_css, build_rule, clear, ensure_id, svgicon
 from iframe_comm import IframeClient, IframeWrapper
+from modals import create_custom_dialog
+from widgets import create_button
 
 CLASS_NAME = 'comments-editor'
 TOOLBAR_CLASS = 'comments-editor-toolbar'
@@ -27,6 +29,31 @@ add_extra_css(def():
 )
 
 
+def choose_block_style(proceed):
+    create_custom_dialog(_('Choose style'), def(parent, close_modal):
+
+        def action(which):
+            close_modal()
+            proceed(which)
+
+        def s(text, tag):
+            ans = create_button(text, action=action.bind(None, tag))
+            ans.style.marginBottom = '1ex'
+            return ans
+
+        spc = '\xa0'
+
+        parent.appendChild(E.div(
+            E.div(_('Choose the block style you would like to use')),
+        E.div(class_='button-box', style='flex-wrap: wrap',
+                s(_('Normal'), 'div'), spc, s('H1', 'h1'), spc, s('H2', 'h2'), spc, s('H3', 'h3'), spc, s('H4', 'h4'), spc, s('H5', 'h5'), spc, s('H6', 'h6'), spc, s(_('Quote'), 'blockquote')
+            )
+        ))
+    )
+
+
+
+
 def all_editor_actions():  # {{{
     if not all_editor_actions.ans:
         all_editor_actions.ans = {
@@ -96,6 +123,17 @@ def all_editor_actions():  # {{{
                 'execute': def (editor, activated):
                     editor.exec_command('insertHorizontalRule')
             },
+            'format-block': {
+                'icon': 'heading',
+                'title': _('Style the selected text block'),
+                'execute': def (editor, activated):
+                    choose_block_style(def(cmd):
+                        if cmd:
+                            editor.exec_command('formatBlock', f'<{cmd}>')
+                            editor.focus()
+                    )
+            },
+
         }
     return all_editor_actions.ans
 # }}}
@@ -272,7 +310,7 @@ def create_comments_editor(container):
     toolbar1 = E.div(class_=TOOLBAR_CLASS)
     toolbars.appendChild(toolbar1)
     acmap = all_editor_actions()
-    for ac_name in 'undo redo select-all remove-format | bold italic underline strikethrough | hr superscript subscript'.split(' '):
+    for ac_name in 'undo redo select-all remove-format | bold italic underline strikethrough | hr superscript subscript format-block'.split(' '):
         if acmap[ac_name]:
             add_action(toolbar1, ac_name, acmap[ac_name], editor.id)
         else: