diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index 7ef3e259b46b501b5dd0053e47a13e9c03684a0c..9f5db0f5afb9f57c39e2bc10965f4bbeb96fa051 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -104,7 +104,7 @@ typedef struct global_data {
 #endif
 
 /*
- * Global Data Flags
+ * Global Data Flags - the top 16 bits are reserved for arch-specific flags
  */
 #define GD_FLG_RELOC		0x00001	/* Code was relocated to RAM	   */
 #define GD_FLG_DEVINIT		0x00002	/* Devices have been initialized   */