diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index cd0378e..8097692 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -40,6 +40,8 @@ typedef struct CPUState CPUState;

 /**
  * CPUClass:
+ * @class_by_name: Callback to map -cpu command line model name to an
+ * instantiatable CPU type.
  * @reset: Callback to reset the #CPUState to its initial state.
  *
  * Represents a CPU family or model.