diff --git a/journal/renderers.py b/journal/renderers.py
index 04c8f2dc..2fe78d02 100644
--- a/journal/renderers.py
+++ b/journal/renderers.py
@@ -20,13 +20,18 @@ _mistune_plugins = [
 _markdown = mistune.create_markdown(plugins=_mistune_plugins)
 
 
+def convert_leading_space_in_md(body) -> str:
+    body = re.sub(r"^\s+$", "", body, flags=re.MULTILINE)
+    body = re.sub(
+        r"^(\u2003*)( +)",
+        lambda s: "\u2003" * ((len(s[2]) + 1) // 2 + len(s[1])),
+        body,
+        flags=re.MULTILINE,
+    )
+    return body
+
+
 def render_md(s) -> str:
-    # s = "\n".join(
-    #     [
-    #         re.sub(r"^(\u2003+)", lambda s: " " * len(s[0]), line)
-    #         for line in s.split("\n")
-    #     ]
-    # )
     return cast(str, _markdown(s))
 
 
diff --git a/journal/templates/review_edit.html b/journal/templates/review_edit.html
index fa986b00..5745cc94 100644
--- a/journal/templates/review_edit.html
+++ b/journal/templates/review_edit.html
@@ -31,9 +31,9 @@
             <hr>
             <div class="grid">
               <div>
-                <label for="leading_space" style="display: inline;">
+                <label for="leading_space" style="display: inline">
                   <input type="checkbox" name="leading_space" value="1" id="leading_space">
-                  转换行首空格为全角
+                  保存时<span data-tooltip="希望行首缩进但不便输全角时可选此替换两半角为一全角">将行首空格替换为全角</span>
                 </label>
               </div>
               <div>{{ form.visibility }}</div>
@@ -64,6 +64,56 @@
             </script>
             {{ form.media }}
           </form>
+          <hr>
+          <details>
+            <summary>Markdown语法参考</summary>
+            <pre>
+标题
+====
+
+副标题
+------
+
+  新起段落需隔开一空行
+
+  段首缩进需使用中文全角空格
+
+[链接](https://zh.wikipedia.org/wiki/Markdown)
+**粗体**  *斜体* ==高亮== ~~删除~~
+^上^标 ~下~标 [拼(pīn)音(yīn)]
+
+> 引用
+> 文本
+>> 多级引用
+
+行内 >! 剧透预警 !< （在短评中也可使用）
+
+>! 多行
+>! 剧透
+
+引用外部图片 ![](https://upload.wikimedia.org/wikipedia/en/8/80/Wikipedia-logo-v2.svg)
+
+上传图片可拖拽图片文件到编辑框，或从剪贴板粘贴
+
+---
+
+- Bullet
+- Points
+
+content in paragraph with footnote[^1] markup.
+[^1]: footnote explain
+
+```
+code
+```
+
+Table Header  | Second Header
+------------- | -------------
+Content Cell  | Content Cell
+Content Cell  | Content Cell
+
+            </pre>
+          </details>
         </article>
       </div>
       <aside>
diff --git a/journal/views.py b/journal/views.py
index 1ffbc852..a9e4c07b 100644
--- a/journal/views.py
+++ b/journal/views.py
@@ -9,6 +9,8 @@ from django.db.models import Count
 from django.utils import timezone
 from django.utils.dateparse import parse_datetime
 from django.core.paginator import Paginator
+
+from journal.renderers import convert_leading_space_in_md
 from .models import *
 from django.conf import settings
 from django.http import HttpResponseRedirect
@@ -570,12 +572,7 @@ def review_edit(request, item_uuid, review_uuid=None):
                 )
             body = form.instance.body
             if request.POST.get("leading_space"):
-                body = re.sub(
-                    r"^(\u2003*)( +)",
-                    lambda s: "\u2003" * ((len(s[2]) + 1) // 2 + len(s[1])),
-                    body,
-                    flags=re.MULTILINE,
-                )
+                body = convert_leading_space_in_md(body)
             review = Review.review_item_by_user(
                 item,
                 request.user,