Mention calendarObserveDST as an unsupported feature
diff --git a/site/unsupported.md b/site/unsupported.md
index d824c2e..bdf8efd 100644
--- a/site/unsupported.md
+++ b/site/unsupported.md
@@ -55,6 +55,7 @@
* nilKind="logicalValue" {% jira 201 %}
* occursCountKind="stopValue", occursStopValue {% jira 501 %}
* utf16Width="variable" {% jira 551 %}
+* calendarObserveDST {% jira 521 %}
#### Miscellaneous
@@ -74,4 +75,4 @@
* Erratum 5.39 - Choice branches that are zero-occurrence arrays are missing. {% jira 2420 %}
* Erratum 5.40 - complex type cannot have hiddenGroupRef as its model group {% jira 2419 %}
* Erratum 5.47 - Encoding/Decoding errors - dfdl:encodingErrorPolicy="error" not implemented.{% jira 935 %}
-* Erratum 5.62 - documentFinalTerminatorCanBeMissing - property is not implemented.{% jira 230 %}
\ No newline at end of file
+* Erratum 5.62 - documentFinalTerminatorCanBeMissing - property is not implemented.{% jira 230 %}
