diff --git a/actionpack/lib/action_controller/metal/request_forgery_protection.rb b/actionpack/lib/action_controller/metal/request_forgery_protection.rb
index a7bd3622eede0b97fedb83500f4ef1ec46ae76d2..4cb634477eccce62b1ae94aa518253018eb3895e 100644
--- a/actionpack/lib/action_controller/metal/request_forgery_protection.rb
+++ b/actionpack/lib/action_controller/metal/request_forgery_protection.rb
@@ -258,7 +258,7 @@ def non_xhr_javascript_response?
 
       # Returns true or false if a request is verified. Checks:
       #
-      # * is it a GET or HEAD request?  Gets should be safe and idempotent
+      # * Is it a GET or HEAD request?  Gets should be safe and idempotent
       # * Does the form_authenticity_token match the given token value from the params?
       # * Does the X-CSRF-Token header match the form_authenticity_token
       def verified_request?
diff --git a/actionview/lib/action_view/helpers/number_helper.rb b/actionview/lib/action_view/helpers/number_helper.rb
index ca8d30e4ef586ae10e24d27dc5785408730bae15..13effa592dbb8569c574944b72e5f0abacc73940 100644
--- a/actionview/lib/action_view/helpers/number_helper.rb
+++ b/actionview/lib/action_view/helpers/number_helper.rb
@@ -279,7 +279,7 @@ def number_to_human_size(number, options = {})
       # See <tt>number_to_human_size</tt> if you want to print a file
       # size.
       #
-      # You can also define you own unit-quantifier names if you want
+      # You can also define your own unit-quantifier names if you want
       # to use other decimal units (eg.: 1500 becomes "1.5
       # kilometers", 0.150 becomes "150 milliliters", etc). You may
       # define a wide range of unit quantifiers, even fractional ones
diff --git a/activerecord/lib/active_record/transactions.rb b/activerecord/lib/active_record/transactions.rb
index 311dacb4497c54d80b04dbe41f6e2fc676a65b47..6f2def0df13b48ab7e1e50f3633638d8127fc287 100644
--- a/activerecord/lib/active_record/transactions.rb
+++ b/activerecord/lib/active_record/transactions.rb
@@ -196,9 +196,9 @@ module Transactions
     # automatically released. The following example demonstrates the problem:
     #
     #   Model.connection.transaction do                           # BEGIN
-    #     Model.connection.transaction(requires_new: true) do  # CREATE SAVEPOINT active_record_1
+    #     Model.connection.transaction(requires_new: true) do     # CREATE SAVEPOINT active_record_1
     #       Model.connection.create_table(...)                    # active_record_1 now automatically released
-    #     end                                                     # RELEASE savepoint active_record_1
+    #     end                                                     # RELEASE SAVEPOINT active_record_1
     #                                                             # ^^^^ BOOM! database error!
     #   end
     #
diff --git a/guides/source/development_dependencies_install.md b/guides/source/development_dependencies_install.md
index 4b10d005eb71143a86dc6cbcb6855f62d1add724..295e48f4934e2723b5d05dffc85df259d3c0e763 100644
--- a/guides/source/development_dependencies_install.md
+++ b/guides/source/development_dependencies_install.md
@@ -28,7 +28,7 @@ In case you can't use the Rails development box, see section below, these are th
 Ruby on Rails uses Git for source code control. The [Git homepage](http://git-scm.com/) has installation instructions. There are a variety of resources on the net that will help you get familiar with Git:
 
 * [Try Git course](http://try.github.io/) is an interactive course that will teach you the basics.
-* The [official Documentation](http://git-scm.com/documentation) is pretty comprehensive and also contains some videos with the basics of Git
+* The [official Documentation](http://git-scm.com/documentation) is pretty comprehensive and also contains some videos with the basics of Git.
 * [Everyday Git](http://schacon.github.io/git/everyday.html) will teach you just enough about Git to get by.
 * The [PeepCode screencast](https://peepcode.com/products/git) on Git is easier to follow.
 * [GitHub](http://help.github.com) offers links to a variety of Git resources.
diff --git a/guides/source/form_helpers.md b/guides/source/form_helpers.md
index 853227e2a1957611f3620173840421b8f21ff8c6..8f7d97844efd869f2c08fd7400f7b9c31b0be718 100644
--- a/guides/source/form_helpers.md
+++ b/guides/source/form_helpers.md
@@ -291,8 +291,8 @@ You can create a similar binding without actually creating `<form>` tags with th
 ```erb
 <%= form_for @person, url: {action: "create"} do |person_form| %>
   <%= person_form.text_field :name %>
-  <%= fields_for @person.contact_detail do |contact_details_form| %>
-    <%= contact_details_form.text_field :phone_number %>
+  <%= fields_for @person.contact_detail do |contact_detail_form| %>
+    <%= contact_detail_form.text_field :phone_number %>
   <% end %>
 <% end %>
 ```
@@ -441,7 +441,7 @@ Whenever Rails sees that the internal value of an option being generated matches
 
 TIP: The second argument to `options_for_select` must be exactly equal to the desired internal value. In particular if the value is the integer `2` you cannot pass `"2"` to `options_for_select` - you must pass `2`. Be aware of values extracted from the `params` hash as they are all strings.
 
-WARNING: when `:include_blank` or `:prompt` are not present, `:include_blank` is forced true if the select attribute `required` is true, display `size` is one and `multiple` is not true.
+WARNING: When `:include_blank` or `:prompt` are not present, `:include_blank` is forced true if the select attribute `required` is true, display `size` is one and `multiple` is not true.
 
 You can add arbitrary attributes to the options using hashes: