diff --git a/packages/memory-service/src/entities/index.js b/packages/memory-service/src/entities/index.js
index e780c93..55c4479 100644
--- a/packages/memory-service/src/entities/index.js
+++ b/packages/memory-service/src/entities/index.js
@@ -10,9 +10,9 @@ function upsertEntity(name, type, notes = null, metadata = null) {
         INSERT INTO entities (name, type, notes, metadata)
         VALUES (?, ?, ?, ?)
         ON CONFLICT(name, type) DO UPDATE SET
-            notes       = excluded.notes,
-            metadata    = excluded.metadata,
-            updated_at  = unixepoch()
+            notes      = COALESCE(entities.notes, excluded.notes),
+            metadata   = excluded.metadata,
+            updated_at = unixepoch()
     `);
     const result = stmt.run(name, type, notes, metadata ? JSON.stringify(metadata) : null);