diff --git a/app/templates/login.html b/app/templates/login.html
index 794be80..b8eb118 100644
--- a/app/templates/login.html
+++ b/app/templates/login.html
@@ -32,7 +32,7 @@
 <div class="container">
 
   <section class="signin-heading">
-    <h1>Sign In</h1>
+    <h1>Sign in</h1>
   </section>
 
   <input type="text" placeholder="用户名" class="username" id="username">
diff --git a/app/templates/signup.html b/app/templates/signup.html
index 9030d41..5b3aafe 100644
--- a/app/templates/signup.html
+++ b/app/templates/signup.html
@@ -53,7 +53,7 @@ You're logged in already! <a href="/logout">Logout</a>.
 <div class="container">
 
   <section class="signin-heading">
-    <h1>Sign Up</h1>
+    <h1>Sign up</h1>
   </section>
 
   <p><input type="username" id="username" placeholder="输入用户名" class="username"></p>