6 files changed, 12 insertions, 9 deletions
diff --git a/guides/source/active_record_postgresql.md b/guides/source/active_record_postgresql.md
index 041fdacbab..8543fcd20f 100644
--- a/guides/source/active_record_postgresql.md
+++ b/guides/source/active_record_postgresql.md
@@ -114,16 +114,21 @@ Profile.where("settings->'color' = ?", "yellow")
 # => #<ActiveRecord::Relation [#<Profile id: 1, settings: {"color"=>"yellow", "resolution"=>"1280x1024"}>]>
 ```
 
-### JSON
+### JSON and JSONB
 
 * [type definition](http://www.postgresql.org/docs/current/static/datatype-json.html)
 * [functions and operators](http://www.postgresql.org/docs/current/static/functions-json.html)
 
 ```ruby
 # db/migrate/20131220144913_create_events.rb
+# ... for json datatype:
 create_table :events do |t|
   t.json 'payload'
 end
+# ... or for jsonb datatype:
+create_table :events do |t|
+  t.jsonb 'payload'
+end
 
 # app/models/event.rb
 class Event < ApplicationRecord
diff --git a/guides/source/active_record_querying.md b/guides/source/active_record_querying.md
index 3676462788..215142223d 100644
--- a/guides/source/active_record_querying.md
+++ b/guides/source/active_record_querying.md
@@ -513,8 +513,6 @@ Article.where(author: author)
 Author.joins(:articles).where(articles: { author: author })
 ```
 
-NOTE: The values cannot be symbols. For example, you cannot do `Client.where(status: :active)`.
-
 #### Range Conditions
 
 ```ruby
diff --git a/guides/source/initialization.md b/guides/source/initialization.md
index 3ea156c6fe..86aea2c24d 100644
--- a/guides/source/initialization.md
+++ b/guides/source/initialization.md
@@ -155,7 +155,7 @@ defined here to find the matching command.
 ### `rails/command.rb`
 
 When one types a Rails command, `invoke` tries to lookup a command for the given
-namespace and executing the command if found.
+namespace and executes the command if found.
 
 If Rails doesn't recognize the command, it hands the reins over to Rake
 to run a task of the same name.
diff --git a/guides/source/layouts_and_rendering.md b/guides/source/layouts_and_rendering.md
index caa3d21d23..c96cf61761 100644
--- a/guides/source/layouts_and_rendering.md
+++ b/guides/source/layouts_and_rendering.md
@@ -1171,7 +1171,7 @@ To pass a local variable to a partial in only specific cases use the `local_assi
 
 This way it is possible to use the partial without the need to declare all local variables.
 
-Every partial also has a local variable with the same name as the partial (minus the underscore). You can pass an object in to this local variable via the `:object` option:
+Every partial also has a local variable with the same name as the partial (minus the leading underscore). You can pass an object in to this local variable via the `:object` option:
 
 ```erb
 <%= render partial: "customer", object: @new_customer %>
diff --git a/guides/source/security.md b/guides/source/security.md
index 9b1f28a283..297680b176 100644
--- a/guides/source/security.md
+++ b/guides/source/security.md
@@ -1061,6 +1061,6 @@ Additional Resources
 The security landscape shifts and it is important to keep up to date, because missing a new vulnerability can be catastrophic. You can find additional resources about (Rails) security here:
 
 * Subscribe to the Rails security [mailing list.](http://groups.google.com/group/rubyonrails-security)
-* [Brakeman - Rails Security Scanner](http://brakemanscanner.org/)- To perform static security analysis for Rails applications.
+* [Brakeman - Rails Security Scanner](http://brakemanscanner.org/) - To perform static security analysis for Rails applications.
 * [Keep up to date on the other application layers.](http://secunia.com/) (they have a weekly newsletter, too)
 * A [good security blog](https://www.owasp.org) including the [Cross-Site scripting Cheat Sheet.](https://www.owasp.org/index.php/DOM_based_XSS_Prevention_Cheat_Sheet)
diff --git a/guides/source/working_with_javascript_in_rails.md b/guides/source/working_with_javascript_in_rails.md
index 35e6aea4cf..ed27752a06 100644
--- a/guides/source/working_with_javascript_in_rails.md
+++ b/guides/source/working_with_javascript_in_rails.md
@@ -382,9 +382,9 @@ Rails 5.1 introduced rails-ujs and dropped jQuery as a dependency.
 As a result the Unobtrusive JavaScript (UJS) driver has been rewritten to operate without jQuery.
 These introductions cause small changes to `custom events` fired during the request:
 
-NOTE: Signature of calls to UJS’s event handlers have changed.
-Unlike the version with jqeury, all custom events return only one parameter: `event`.
-In this parameter, there is an additional attribute `details` which contains an array of extra parameters.
+NOTE: Signature of calls to UJS’s event handlers has changed.
+Unlike the version with jQuery, all custom events return only one parameter: `event`.
+In this parameter, there is an additional attribute `detail` which contains an array of extra parameters.
 
 | Event name          | Extra parameters (event.detail) | Fired                                                       |
 |---------------------|---------------------------------|-------------------------------------------------------------|