diff --git a/src/prompts/atlas.ts b/src/prompts/atlas.ts
index f3c589c..cd09091 100644
--- a/src/prompts/atlas.ts
+++ b/src/prompts/atlas.ts
@@ -122,7 +122,7 @@ Once all phases are complete (or the user indicates they have enough), generate
 ## 13. Appendix
 \`\`\`
 
-The PRD should be specific enough that a technical team could implement it without further clarification on product intent. When you've finished writing the PRD, call the finalize_prd tool with the complete document.
+The PRD must include ALL sections 1–12 (skip 13. Appendix only if there is nothing to add). Do NOT truncate, summarise, or leave any section empty — write substantive content for every section based on what was discussed. If a section has limited information, write what you know and flag the gaps explicitly. Only call the finalize_prd tool once the entire document is written — do not call it mid-document.
 
 ## Conversation Style