diff --git a/extensions/callisto-theme.yaml b/extensions/callisto-theme.yaml
new file mode 100644
index 0000000..547727b
--- /dev/null
+++ b/extensions/callisto-theme.yaml
@@ -0,0 +1,20 @@
+---
+id: com.aliciasykes.aht-theme
+github: Lissy93/callisto-theme-standard-notes
+main: main.css
+
+name: Callisto
+content_type: SN|Theme
+area: themes
+version: 0.0.1
+marketing_url: https://github.com/Lissy93/callisto-theme-standard-notes
+thumbnail_url: https://i.ibb.co/PGTCTT1/sn-callisto-screenshot-1.png
+description: Dusty background with teal accents.
+
+statusBar: dark-content
+dock_icon:
+  type: circle
+  background_color: '#0b1021'
+  foreground_color: '#d6085a'
+  border_color: '#1EE3B5'
+...