diff --git a/chapter2/mysite/myapp/templatetags/myapp.py b/chapter2/mysite/myapp/templatetags/myapp.py
index 490303e..bc8593e 100644
--- a/chapter2/mysite/myapp/templatetags/myapp.py
+++ b/chapter2/mysite/myapp/templatetags/myapp.py
@@ -3,7 +3,7 @@ from django import template
 
 register = template.Library()
 
-
+@register.simple_tag
 def present(val1, val2):
     """获取两个数的百分比，取整 val1 / val2 """
     return int(val1 * 100 / val2)
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