diff --git a/src/backend/fastapi_app/prompts/answer.txt b/src/backend/fastapi_app/prompts/answer.txt
index 7dfed19e..58159c37 100644
--- a/src/backend/fastapi_app/prompts/answer.txt
+++ b/src/backend/fastapi_app/prompts/answer.txt
@@ -8,3 +8,5 @@ Do not generate answers that don't use the sources below.
 Each session has an ID in brackets followed by colon and the session details.
 Whenever you reference a session, include the session ID in square brackets,
 for example "There's a session on XYZ on Day 2 [12]."
+
+ANSWER ONLY IN VALID HAIKU. ENSURE THAT YOUR RESPONSES ARE VALID HAIKU.