diff --git a/guides/code/getting_started/public/robots.txt b/guides/code/getting_started/public/robots.txt
index 085187fa58b..1a3a5e4dd25 100644
--- a/guides/code/getting_started/public/robots.txt
+++ b/guides/code/getting_started/public/robots.txt
@@ -1,5 +1,5 @@
 # See http://www.robotstxt.org/wc/norobots.html for documentation on how to use the robots.txt file
 #
 # To ban all spiders from the entire site uncomment the next two lines:
-# User-Agent: *
+# User-agent: *
 # Disallow: /
diff --git a/railties/lib/rails/generators/rails/app/templates/public/robots.txt b/railties/lib/rails/generators/rails/app/templates/public/robots.txt
index 085187fa58b..1a3a5e4dd25 100644
--- a/railties/lib/rails/generators/rails/app/templates/public/robots.txt
+++ b/railties/lib/rails/generators/rails/app/templates/public/robots.txt
@@ -1,5 +1,5 @@
 # See http://www.robotstxt.org/wc/norobots.html for documentation on how to use the robots.txt file
 #
 # To ban all spiders from the entire site uncomment the next two lines:
-# User-Agent: *
+# User-agent: *
 # Disallow: /