diff --git a/app/constants/themes.js b/app/constants/themes.js
new file mode 100644
index 0000000..34bbef4
--- /dev/null
+++ b/app/constants/themes.js
@@ -0,0 +1,4 @@
+// @flow
+
+export const LIGHT = 'light';
+export const DARK = 'dark';