diff --git a/packages/memory-service/src/entities/extraction.js b/packages/memory-service/src/entities/extraction.js
index 6a5418a..556f46c 100644
--- a/packages/memory-service/src/entities/extraction.js
+++ b/packages/memory-service/src/entities/extraction.js
@@ -26,6 +26,7 @@ function buildExtractionPrompt(userMessage, aiResponse, knownEntities = []) {
         `Entity types to extract: ${ENTITY_TYPES.join(', ')}`,
         'For each entity found, provide: name, type, and a one-sentence notes field.',
         'Return your answer as: { "entities": [ ... ] }',
+        'For each entity found, you MUST provide a non-empty notes field describing it based on the conversation.',
         '',
         knownBlock,
         '--- CONVERSATION ---',   // clear delimiter helps smaller models