diff --git a/pydantic_ai_slim/pydantic_ai/messages.py b/pydantic_ai_slim/pydantic_ai/messages.py
index eaea7925..5c61ce0a 100644
--- a/pydantic_ai_slim/pydantic_ai/messages.py
+++ b/pydantic_ai_slim/pydantic_ai/messages.py
@@ -29,7 +29,7 @@ class SystemPromptPart:
 class DynamicSystemPromptPart(SystemPromptPart):
     """A system prompt that is generated dynamically.
 
-    Same as SystemPromptPart, but its content is regenerated on each run.
+    Same as `SystemPromptPart`, but its content is regenerated on each run.
     """
 
     ref: int | None = None