diff --git a/nixos/modules/i18n/input-method/default.xml b/nixos/modules/i18n/input-method/default.xml
index c55ac1ec245..a32ed100df3 100644
--- a/nixos/modules/i18n/input-method/default.xml
+++ b/nixos/modules/i18n/input-method/default.xml
@@ -88,6 +88,8 @@ i18n.inputMethod = {
       methods among Traditional Chinese Unix users.</para></listitem>
   <listitem><para>Hangul (<literal>fcitx-engines.hangul</literal>): Korean input 
       method.</para></listitem>
+  <listitem><para>Unikey (<literal>fcitx-engines.unikey</literal>): Vietnamese input 
+      method.</para></listitem>
   <listitem><para>m17n (<literal>fcitx-engines.m17n</literal>): m17n is an input 
       method that uses input methods and corresponding icons in the m17n 
       database.</para></listitem>