diff --git a/README.md b/README.md
index 98f3771..e0d4592 100644
--- a/README.md
+++ b/README.md
@@ -2,5 +2,7 @@
 
 This is an iOS app that connects to an Apple IIgs over a network and streams text to it from voice dicatation.
 
+It relies on the [Speech Framework](https://developer.apple.com/documentation/speech) built into recent versions of iOS.
+
 This app uses [SwiftSocket v2.1.0](https://github.com/swiftsocket/SwiftSocket/tree/2.1.0) for opening the TCP connection to the Apple IIgs.
 It also uses [BinUtils](https://github.com/nst/BinUtils) for packing/unpacking structures on the TCP connection.