diff --git a/x-pack/solutions/observability/plugins/observability_ai_assistant_app/server/functions/documentation.ts b/x-pack/solutions/observability/plugins/observability_ai_assistant_app/server/functions/documentation.ts
index d8c7770db5c54..a8a897c28fcc8 100644
--- a/x-pack/solutions/observability/plugins/observability_ai_assistant_app/server/functions/documentation.ts
+++ b/x-pack/solutions/observability/plugins/observability_ai_assistant_app/server/functions/documentation.ts
@@ -43,6 +43,7 @@ export async function registerDocumentationFunction({
         properties: {
           query: {
             description: `The query to use to retrieve documentation
+            Always write the query in English, as the documentation is available only in English.
             Examples:
             - "How to enable TLS for Elasticsearch?"
             - "What is Kibana Lens?"`,