diff --git a/language/en-GB/tpl_cassiopeia.ini b/language/en-GB/tpl_cassiopeia.ini
index f8b0cd3cd810..6ba37b8327fb 100644
--- a/language/en-GB/tpl_cassiopeia.ini
+++ b/language/en-GB/tpl_cassiopeia.ini
@@ -4,6 +4,7 @@
 ; Note : All ini files need to be saved as UTF-8
 
 CASSIOPEIA="Cassiopeia Site template"
+CASSIOPEIA_EXTENDED="Cassiopeia Extended"
 TPL_CASSIOPEIA_BACKTOTOP="Back to Top"
 TPL_CASSIOPEIA_BACKTOTOP_LABEL="Back-to-top Link"
 TPL_CASSIOPEIA_BODY_BACKGROUND_COLOR_LABEL="Body Background Colour"
diff --git a/language/en-GB/tpl_cassiopeia.sys.ini b/language/en-GB/tpl_cassiopeia.sys.ini
index 88d27dac3095..ef2f5601b518 100644
--- a/language/en-GB/tpl_cassiopeia.sys.ini
+++ b/language/en-GB/tpl_cassiopeia.sys.ini
@@ -4,6 +4,7 @@
 ; Note : All ini files need to be saved as UTF-8
 
 CASSIOPEIA="Cassiopeia Site template"
+CASSIOPEIA_EXTENDED="Cassiopeia Extended"
 TPL_CASSIOPEIA_COLORS_FIELDSET_LABEL="Colour Settings"
 TPL_CASSIOPEIA_EXTENDED_XML_DESCRIPTION="Continuing the space theme (Solarflare from 1.0, Milkyway from 1.5 and Protostar from 3.0), Cassiopeia is the Joomla site template based on Bootstrap 5. This is an extended child version with a new colour set for the base Cassiopeia template."
 TPL_CASSIOPEIA_FONTS_FIELDSET_LABEL="Font Settings"