diff --git a/common/bcp47/calendar.xml b/common/bcp47/calendar.xml
index a835523a4c2..e08e7907724 100644
--- a/common/bcp47/calendar.xml
+++ b/common/bcp47/calendar.xml
@@ -28,6 +28,8 @@ For terms of use, see http://www.unicode.org/copyright.html
             <type name="japanese" description="Japanese Imperial calendar"/>
             <type name="persian" description="Persian calendar"/>
             <type name="roc" description="Republic of China calendar"/>
+            <type name="tibetan" description="Tibetan Calendar"/>
+            <type name="tibetan-tsurphu" description="Tibetan Calendar, Tsurphu tradition"/>
 
             <type name="islamicc" description="Civil (algorithmic) Arabic calendar" deprecated="true" preferred="islamic-civil"  alias="islamic-civil"/>
         </key>