diff --git a/atlasbot/llm/client.py b/atlasbot/llm/client.py
index 28c6d19..a987e4d 100644
--- a/atlasbot/llm/client.py
+++ b/atlasbot/llm/client.py
@@ -60,9 +60,10 @@ class LLMClient:
 
 
 def build_messages(system: str, prompt: str, *, context: str | None = None) -> list[dict[str, str]]:
-    messages: list[dict[str, str]] = [{"role": "system", "content": system}]
+    system_content = system
     if context:
-        messages.append({"role": "user", "content": "Context (grounded):\n" + context})
+        system_content = system_content + "\n\nContext (grounded facts):\n" + context
+    messages: list[dict[str, str]] = [{"role": "system", "content": system_content}]
     messages.append({"role": "user", "content": prompt})
     return messages