diff --git a/README.md b/README.md
index a6942ce..b0a187d 100644
--- a/README.md
+++ b/README.md
@@ -56,25 +56,25 @@ Configuration will be read from `config/cache.yml` or `config/solid_cache.yml`.
 The format of the file is:
 
 ```yml
-default:
-  store_options: &default_store_options
+shared:
+  store_options:
     max_age: <%= 60.days.to_i %>
     namespace: <%= Rails.env %>
   size_estimate_samples: 1000
 
-development: &development
+development:
   database: cache
   store_options:
-    <<: *default_store_options
     max_size: <%= 256.gigabytes %>
 
-production: &production
+production:
   databases: [production_cache1, production_cache2]
   store_options:
-    <<: *default_store_options
     max_size: <%= 256.gigabytes %>
 ```
 
+The `shared` key is read by Rails' `config_for` and deep merged into the configuration of every environment, with the environment's own values taking precedence.
+
 For the full list of keys for `store_options` see [Cache configuration](#cache-configuration). Any options passed to the cache lookup will overwrite those specified here.
 
 After running `solid_cache:install`, `environments/production.rb` will replace your cache store with Solid Cache, but you can also do this manually:
diff --git a/lib/generators/solid_cache/install/templates/config/cache.yml.tt b/lib/generators/solid_cache/install/templates/config/cache.yml.tt
index 70a2ac6..52b4a16 100644
--- a/lib/generators/solid_cache/install/templates/config/cache.yml.tt
+++ b/lib/generators/solid_cache/install/templates/config/cache.yml.tt
@@ -1,16 +1,9 @@
-default: &default
+shared:
   store_options:
     # Cap age of oldest cache entry to fulfill retention policies
     # max_age: <%%= 60.days.to_i %>
     max_size: <%%= 256.megabytes %>
     namespace: <%%= Rails.env %>
 
-development:
-  <<: *default
-
-test:
-  <<: *default
-
 production:
   database: <%= ENV.fetch("DATABASE", "cache") %>
-  <<: *default
diff --git a/test/lib/generators/solid_cache/solid_cache/install_generator_test.rb b/test/lib/generators/solid_cache/solid_cache/install_generator_test.rb
index fd12cbc..83ce8f8 100644
--- a/test/lib/generators/solid_cache/solid_cache/install_generator_test.rb
+++ b/test/lib/generators/solid_cache/solid_cache/install_generator_test.rb
@@ -71,22 +71,15 @@ class SolidCache::InstallGeneratorTest < Rails::Generators::TestCase
     private
       def expected_cache_config
         <<~YAML
-          default: &default
+          shared:
             store_options:
               # Cap age of oldest cache entry to fulfill retention policies
               # max_age: <%= 60.days.to_i %>
               max_size: <%= 256.megabytes %>
               namespace: <%= Rails.env %>
 
-          development:
-            <<: *default
-
-          test:
-            <<: *default
-
           production:
             database: cache
-            <<: *default
         YAML
       end
   end