diff --git a/TODO.md b/TODO.md
index d00ccca2..afdef9d5 100644
--- a/TODO.md
+++ b/TODO.md
@@ -90,6 +90,7 @@
 ## GacGen.exe
 
 * Enable linking to external symbols
+* Generate `ITheme` implementation
 * **(optional)** In the final pass, only workflow scripts are printed
     * Use WorkflowCompiler.exe to do codegen externally