diff --git a/litellm/proxy/guardrails/guardrail_hooks/panw_prisma_airs/panw_prisma_airs.py b/litellm/proxy/guardrails/guardrail_hooks/panw_prisma_airs/panw_prisma_airs.py
index 92296e6cde9..68a403aa3d5 100644
--- a/litellm/proxy/guardrails/guardrail_hooks/panw_prisma_airs/panw_prisma_airs.py
+++ b/litellm/proxy/guardrails/guardrail_hooks/panw_prisma_airs/panw_prisma_airs.py
@@ -194,8 +194,7 @@ class PanwPrismaAirsHandler(CustomGuardrail):
         # internal '<=' comparison and surfaces as a misleading api_error.
         self.timeout = float(timeout) if timeout is not None else 10.0
 
-        # Tri-state: None = not set (latest-only for Anthropic /v1/messages, full history
-        # otherwise), True = latest-only for every request shape, False = full history everywhere
+        # Tri-state scan-scope flag; resolution semantics in _use_latest_user_only()
         self.experimental_use_latest_role_message_only: bool | None = kwargs.get(
             "experimental_use_latest_role_message_only"
         )
@@ -1774,8 +1773,6 @@ class PanwPrismaAirsHandler(CustomGuardrail):
         if input_type == "request":
             structured_messages: Final = inputs.get("structured_messages")
             if structured_messages:
-                # Latest-user-only scanning: flag-controlled for every request shape,
-                # default-on only for Anthropic /v1/messages (see _use_latest_user_only).
                 # Uses request_data["messages"] (original format), NOT structured_messages
                 # (which has injected system content from adapter translation).
                 if self._use_latest_user_only(request_data, logging_obj):
diff --git a/litellm/types/proxy/guardrails/guardrail_hooks/panw_prisma_airs.py b/litellm/types/proxy/guardrails/guardrail_hooks/panw_prisma_airs.py
index f12dd927661..96fcc358fa7 100644
--- a/litellm/types/proxy/guardrails/guardrail_hooks/panw_prisma_airs.py
+++ b/litellm/types/proxy/guardrails/guardrail_hooks/panw_prisma_airs.py
@@ -58,7 +58,10 @@ class PanwPrismaAirsGuardrailConfigModel(GuardrailConfigModel):
         "the full conversation history. Set true to enable for every request shape (avoids "
         "rescanning prior turns on every call of a multi-turn conversation); set false to always "
         "scan all user/system/developer messages. When unset: defaults to latest-only for "
-        "Anthropic /v1/messages requests and full-history for all other request shapes.",
+        "Anthropic /v1/messages requests and full-history for all other request shapes. "
+        "Latest-only scanning trusts caller-supplied history: earlier messages in the request "
+        "are not rescanned, so enable it only where each turn was scanned when it was the "
+        "latest message (well-behaved chat clients) or history is server-controlled.",
     )
 
     @staticmethod