diff --git a/docs/ServiceList.md b/docs/ServiceList.md
index 140c7c1..7825d11 100644
--- a/docs/ServiceList.md
+++ b/docs/ServiceList.md
@@ -1,3 +1,3 @@
 # HomeSpan Services and Characteristics
 
-The following tables show which HomeKit Services and Characteristics and supported by HomeSpan. In general, HomeSpan supports all HomeKit Services except for those that involve video or audio streaming, or advanced lock management.
+The following tables list the HomeKit Services and Characteristics supported by HomeSpan. In general, HomeSpan supports all HomeKit Services described in Apple's [HomeKit Accessory Protocol Specification (HAP) Release R2](https://developer.apple.com/support/homekit-accessory-protocol/), except for those that involve video or audio streaming, Apple TV, or advanced lock management (i.e. all HAP Services except those that require Characteristics with a TLV8 data type).