diff --git a/guides/source/asset_pipeline.md b/guides/source/asset_pipeline.md
index e6631a513c..ea787a4dc0 100644
--- a/guides/source/asset_pipeline.md
+++ b/guides/source/asset_pipeline.md
@@ -485,7 +485,7 @@ which contains these lines:
 
 Rails creates both `app/assets/javascripts/application.js` and
 `app/assets/stylesheets/application.css` regardless of whether the
---skip-sprockets option is used when creating a new rails application. This is
+--skip-sprockets option is used when creating a new Rails application. This is
 so you can easily add asset pipelining later if you like.
 
 The directives that work in JavaScript files also work in stylesheets
@@ -1024,7 +1024,7 @@ to tell our CDN (and browser) that the asset is "public", that means any cache
 can store the request. Also we commonly want to set `max-age` which is how long
 the cache will store the object before invalidating the cache. The `max-age`
 value is set to seconds with a maximum possible value of `31536000` which is one
-year. You can do this in your rails application by setting
+year. You can do this in your Rails application by setting
 
 ```
 config.public_file_server.headers = {
diff --git a/guides/source/plugins.md b/guides/source/plugins.md
index ff84861b8c..760ff431c0 100644
--- a/guides/source/plugins.md
+++ b/guides/source/plugins.md
@@ -67,7 +67,7 @@ This will tell you that everything got generated properly and you are ready to s
 Extending Core Classes
 ----------------------
 
-This section will explain how to add a method to String that will be available anywhere in your rails application.
+This section will explain how to add a method to String that will be available anywhere in your Rails application.
 
 In this example you will add a method to String named `to_squawk`. To begin, create a new test file with a few assertions:
 
diff --git a/guides/source/security.md b/guides/source/security.md
index 2d1bc3b5b3..36eb61be8b 100644
--- a/guides/source/security.md
+++ b/guides/source/security.md
@@ -965,7 +965,7 @@ When `params[:token]` is one of: `[nil]`, `[nil, nil, ...]` or
 `['foo', nil]` it will bypass the test for `nil`, but `IS NULL` or
 `IN ('foo', NULL)` where clauses still will be added to the SQL query.
 
-To keep rails secure by default, `deep_munge` replaces some of the values with
+To keep Rails secure by default, `deep_munge` replaces some of the values with
 `nil`. Below table shows what the parameters look like based on `JSON` sent in
 request: