diff --git a/README.md b/README.md
index bac86aa..06b13ea 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,11 @@ rake searchkick:reindex CLASS=Book
 
 #### Gotchas
 
-When changing the mapping in a model, you must create a new index for the changes to take place.  Elasticsearch does not support updates to the mapping.  For zero downtime, use the `reindex` method above which creates a new index and swaps it in once built.
+When changing the mapping in a model, you must create a new index for the changes to take place.  Elasticsearch does not support updates to the mapping.  For zero downtime, use the `reindex` method above which creates a new index and swaps it in once built. To see the current mapping, use:
+
+```sh
+curl http://localhost:9200/books/_mapping
+```
 
 ## Installation
 
--
libgit2 0.21.0