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diff --git a/doc/features.txt b/doc/features.txt
index 06f52037..ef20cf2b 100644
--- a/doc/features.txt
+++ b/doc/features.txt
@@ -216,3 +216,10 @@ Radio settings
cellular modem to conserve power when the end user is not actively
using the device but some networking applications are online using
packet data.
+
+Text Telephony
+==============
+
+- TTY (hearing impaired) support, also known as Cellular Text Modem (CTM).
+ In case it's supported by the modem, oFono allows the user to enabled
+ or disable it through the TextTelephony interface.