diff --git a/src/agents/momus.ts b/src/agents/momus.ts
index 4d2a704c9..ca03dd4f5 100644
--- a/src/agents/momus.ts
+++ b/src/agents/momus.ts
@@ -342,5 +342,6 @@ export const momusPromptMetadata: AgentPromptMetadata = {
     "When user explicitly wants to skip review",
     "For trivial plans that don't need formal review",
   ],
-  keyTrigger: "Work plan created → invoke Momus for review before execution",
+  keyTrigger:
+    "Work plan saved to `.sisyphus/plans/*.md` → invoke Momus with the file path as the sole prompt (e.g. `prompt=\".sisyphus/plans/my-plan.md\"`). Do NOT invoke Momus for inline plans or todo lists.",
 };