diff --git a/boards/mdx_neboard.py b/boards/mdx_neboard.py
--- a/boards/mdx_neboard.py
+++ b/boards/mdx_neboard.py
@@ -119,6 +119,15 @@ class CodePattern(TextFormatter):
     format_right = '[/code]'
 
 
+class HintPattern(TextFormatter):
+    name = 'hint'
+    preview_left = '<span class="hint">'
+    preview_right = '</span>'
+
+    format_left = '[hint]'
+    format_right = '[/hint]'
+
+
 def render_reflink(tag_name, value, options, parent, context):
     result = '>>%s' % value
 
@@ -165,6 +174,15 @@ def render_quote(tag_name, value, option
     return result
 
 
+def render_hint(tag_name, value, options, parent, context):
+    if 'hint' in options:
+        hint = options['hint']
+        result = '<span class="hint" title="{}">{}</span>'.format(hint, value)
+    else:
+        result = value
+    return result
+
+
 def render_notification(tag_name, value, options, parent, content):
     username = value.lower()
 
@@ -199,6 +217,7 @@ formatters = [
     CommentPattern,
     StrikeThroughPattern,
     CodePattern,
+    HintPattern,
 ]
 
 
@@ -218,6 +237,7 @@ class Parser:
 
         self.parser.add_formatter('post', render_reflink, strip=True)
         self.parser.add_formatter('quote', render_quote, strip=True)
+        self.parser.add_formatter('hint', render_hint, strip=True)
         self.parser.add_formatter('user', render_notification, strip=True)
         self.parser.add_formatter('tag', render_tag, strip=True)
         self.parser.add_formatter('spoiler', render_spoiler, strip=True)
diff --git a/boards/static/css/base.css b/boards/static/css/base.css
--- a/boards/static/css/base.css
+++ b/boards/static/css/base.css
@@ -164,3 +164,7 @@ textarea, input {
 .required-field:before {
     content: '* ';
 }
+
+.hint {
+    border-bottom: dashed 1px;
+}