diff --git a/docs/Getting Started.md b/docs/Getting Started.md
index 088cfa8..95ddb02 100644
--- a/docs/Getting Started.md	
+++ b/docs/Getting Started.md	
@@ -78,7 +78,7 @@ following plug to our Router (in the appropriate pipeline or place, of course).
 
 ```elixir
 plug ContentSecurityPolicy.Plug.Setup(
-  %ContentSecurityPolicy.Policy{
+  default_policy: %ContentSecurityPolicy.Policy{
     default_src: ["https:", "'self'"],
     img_src: ["https://imgur.com"]
   }
diff --git a/lib/content_security_policy/plug/setup.ex b/lib/content_security_policy/plug/setup.ex
index 1a1fce1..d3928dd 100644
--- a/lib/content_security_policy/plug/setup.ex
+++ b/lib/content_security_policy/plug/setup.ex
@@ -6,6 +6,27 @@ defmodule ContentSecurityPolicy.Plug.Setup do
   This `Plug` registers a `before_send` action that serializes the
   `ContentSecurityPolicy.Policy` struct and inserts the result into the
   `"content-security-policy"` header of the response.
+
+  ## Example Usage
+  
+  In a controller or router: 
+
+      plug ContentSecurityPolicy.Plug.Setup(
+        default_policy: %ContentSecurityPolicy.Policy{
+          default_src: ["https:", "'self'"],
+          img_src: ["*.imgur.com"]
+        }
+      )
+
+
+  The above plug sets the content security policy struct to whatever is passed
+  in. This is assigned to `conn.private.content_security_policy`.
+
+  Before the response is sent, this policy will be serialized into a content
+  security policy that the browser understands.
+
+  In the case of the above, the following response header will be sent:
+  `content-security-policy: default-src https: 'self'; img-src *.imgur.com`
   """
 
   import Plug.Conn