From 90684841852f7d8eeef28714af8c74373ccc77d7 Mon Sep 17 00:00:00 2001
From: Tom H Anderson <tom.h.anderson@gmail.com>
Date: Sat, 23 Jun 2018 14:27:55 -0600
Subject: [PATCH] Added internals section to README

---
 README.md | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 6780cdd..e34cf19 100644
--- a/README.md
+++ b/README.md
@@ -386,7 +386,12 @@ Hydrator Extract Tool
 
 All hydrator extract operations are handled through the Hydrator Extract Tool.  This tool is engineered to be overridden
 thanks to a service manager alias.  Should you find the need to add custom caching to hydrator results this is where to
-to it.
+do it.  To register a custom hydrator extract tool use
+```php
+    'aliases' => [
+        'ZF\Doctrine\GraphQL\Hydrator\HydratorExtractTool' => CustomExtractTool::class,
+    ],
+```
 
 
 Field Resolver