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diff --git a/readme.md b/readme.md
index 80f0a3ab2..62d479ff1 100644
--- a/readme.md
+++ b/readme.md
@@ -323,6 +323,12 @@ This enables MIDI sending and receiving with your keyboard. To enter MIDI send m
 
 This allows you to send unicode symbols via `UC(<unicode>)` in your keymap. Only codes up to 0x7FFF are currently supported.
 
+`UNICODEMAP_ENABLE`
+
+This allows sending unicode symbols using `X(<unicode>)` in your keymap. Codes
+up to 0xFFFFF are supported, including emojis. But you need to maintain a
+separate mapping table in your keymap file.
+
 `BLUETOOTH_ENABLE`
 
 This allows you to interface with a Bluefruit EZ-key to send keycodes wirelessly. It uses the D2 and D3 pins.