diff --git a/README.md b/README.md
index 207d3b6..9f2c4ad 100644
--- a/README.md
+++ b/README.md
@@ -1177,11 +1177,11 @@ end
 
 ### Filterable Fields
 
-By default, all fields are filterable (can be used in `where` option). Speed up indexing and reduce index size by only making some fields filterable.
+By default, all string fields are filterable (can be used in `where` option). Speed up indexing and reduce index size by only making some fields filterable.
 
 ```ruby
 class Product < ActiveRecord::Base
-  searchkick filterable: [:store_id]
+  searchkick filterable: [:brand]
 end
 ```
 
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libgit2 0.21.0