diff --git a/guides/source/caching_with_rails.md b/guides/source/caching_with_rails.md
index e52264f296..a270ec7a7e 100644
--- a/guides/source/caching_with_rails.md
+++ b/guides/source/caching_with_rails.md
@@ -99,14 +99,14 @@ end
 
 This method generates a cache key that depends on all products and can be used in the view:
 
-```ruby
+```erb
 <% cache(cache_key_for_products) do %>
   All available products:
 <% end %>
 ```
 You can also use an Active Record model as the cache key:
 
-```ruby
+```erb
 <% Product.all.each do |p| %>
   <% cache(p) do %>
     <%= link_to p.name, product_url(p) %>
@@ -118,7 +118,7 @@ Behind the scenes, a method called `cache_key` will be invoked on the model and
 
 You can also combine the two schemes which is called "Russian Doll Caching":
 
-```ruby
+```erb
 <% cache(cache_key_for_products) do %>
   All available products:
   <% Product.all.each do |p| %>
diff --git a/guides/source/generators.md b/guides/source/generators.md
index 8b91dfc5a5..1a08eb420a 100644
--- a/guides/source/generators.md
+++ b/guides/source/generators.md
@@ -310,7 +310,7 @@ In Rails 3.0 and above, generators don't just look in the source root for templa
 
 ```erb
 module <%= class_name %>Helper
-  attr_reader :<%= plural_name %>, <%= plural_name.singularize %>
+  attr_reader :<%= plural_name %>, :<%= plural_name.singularize %>
 end
 ```
 
diff --git a/guides/source/plugins.md b/guides/source/plugins.md
index f8f04c3c67..695f25f8a9 100644
--- a/guides/source/plugins.md
+++ b/guides/source/plugins.md
@@ -86,7 +86,7 @@ Run `rake` to run the test. This test should fail because we haven't implemented
 
 Great - now you are ready to start development.
 
-Then in `lib/yaffle.rb` require `lib/core_ext`:
+Then in `lib/yaffle.rb` add `require "yaffle/core_ext"`:
 
 ```ruby
 # yaffle/lib/yaffle.rb