diff --git a/README.md b/README.md
index d46fb53..081188d 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,8 @@ Schematic schematic = Schematic.builder()
 
 ## Usage
 
+A number of these examples use `keys` to identify companies and users. Learn more about keys [here](https://docs.schematichq.com/developer_resources/key_management).
+
 ### Sending identify events
 
 Create or update users and companies using identify events.