diff --git a/lib/prismic.rb b/lib/prismic.rb
index 1cb9ffc..1c95ac3 100644
--- a/lib/prismic.rb
+++ b/lib/prismic.rb
@@ -52,6 +52,7 @@ def full_trace(e=self)
   #   @param [Hash] opts The options
   #   @option opts [String] :access_token (nil) The access_token
   #   @option opts :http_client (DefaultHTTPClient) The HTTP client to use
+  #   @option opts :api_cache (nil) The caching object for the /api endpoint cache (for instance Prismic::Cache) to use
   #   @option opts :cache (nil) The caching object (for instance Prismic::Cache) to use, or false for no caching
   # @overload api(url, access_token)
   #   Provide the access_token (only)