diff --git a/CHANGES.rst b/CHANGES.rst
index 676130399a..36747fd2a5 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -92,6 +92,8 @@ Bug Fixes
 
 - Fixed width of sliders in plugins to use full-width of plugin. [#3303]
 
+- Raise an error when attempting to open in a popout or sidecar when not supported (i.e. within VSCode). [#3309]
+
 Cubeviz
 ^^^^^^^