diff --git a/prompts/planner/plan.md b/prompts/planner/plan.md
index d860ce9..ed4e98b 100644
--- a/prompts/planner/plan.md
+++ b/prompts/planner/plan.md
@@ -24,12 +24,16 @@ Good criteria are specific and checkable:
 - "Running `npm test` passes with no failures"
 - "The config file contains entries for all three required env vars"
 
-Bad criteria are vague or subjective:
+Bad criteria are vague with no way to check:
 - "The code is clean"
 - "Works correctly"
 - "Performance is improved"
 - "Error handling is robust"
 
+For subjective work (design, UX, documentation), criteria should define what to evaluate and how to judge it — not just say "looks good":
+- "Design uses a consistent color palette and typography — no default library styles"
+- "A user can complete the primary action without guessing what to click"
+
 ## PRD Anti-Patterns
 
 Avoid these common mistakes: