diff --git a/source/c02/p17_handle_html_xml_in_text.rst b/source/c02/p17_handle_html_xml_in_text.rst
index 141a8fcb..e125cf90 100644
--- a/source/c02/p17_handle_html_xml_in_text.rst
+++ b/source/c02/p17_handle_html_xml_in_text.rst
@@ -49,7 +49,7 @@
     >>> s = 'Spicy "Jalapeño&quot.'
     >>> from html.parser import HTMLParser
     >>> p = HTMLParser()
-    >>> p.unescape(s)
+    >>> p.unescape(s)  # Python3.5以后使用 html.unescape(s)
     'Spicy "Jalapeño".'
     >>>
     >>> t = 'The prompt is >>>'