diff --git a/chapter5/section3/app.py b/chapter5/section3/app.py
index c69868b..a169e7c 100644
--- a/chapter5/section3/app.py
+++ b/chapter5/section3/app.py
@@ -16,7 +16,7 @@ def signin():
     password = request.form['password']
     error = None
     if len(username) < 5:
-        error = 'Password must be at least 5 characters'
+        error = 'Username must be at least 5 characters'
     if len(password) < 6:
         error = 'Password must be at least 8 characters'
     elif not any(c.isupper() for c in password):
diff --git a/errata.md b/errata.md
index c23fcb3..80074de 100644
--- a/errata.md
+++ b/errata.md
@@ -7,6 +7,7 @@
 | --------------------- |:-------------:| --------------:|-----------:|
 | 第2章 autoenv(P24) 中间 | echo "source source /home/ubuntu..."| echo "source /home/ubuntu..."| @刘一鹤 |
 | 第3章 配置管理(P31) 尾部| app.config.from_envar('SETTINGS') | app.config.from_envar('YOURAPPLICATION_SETTINGS')| @凝霜 |
+| 第5章 使用Ajax 尾部| error = 'Password must be at least 5 ...'| error = 'Username must be at least 5 ...'| @特特特~ |
 
 ### 代码错误