diff --git a/headers/os/kernel/OS.h b/headers/os/kernel/OS.h
index 6a4a93ce27..b13eb7bd20 100644
--- a/headers/os/kernel/OS.h
+++ b/headers/os/kernel/OS.h
@@ -381,8 +381,15 @@ typedef enum cpu_types {
 	B_CPU_AMD_K6_III					= 0x1159,
 
 	B_CPU_AMD_ATHLON_MODEL1				= 0x1161,
-	B_CPU_AMD_ATHLON_THUNDERBIRD			= 0x1164,
-
+	B_CPU_AMD_ATHLON_MODEL2 			= 0x1162,
+		
+	B_CPU_AMD_DURON 					= 0x1163,	
+	
+	B_CPU_AMD_ATHLON_THUNDERBIRD		= 0x1164,
+	B_CPU_AMD_ATHLON_XP 				= 0x1166,
+	B_CPU_AMD_ATHLON_XP_MODEL2,
+	B_CPU_AMD_ATHLON_XP_MODEL3,
+	
 	/* VIA */
 	B_CPU_CYRIX_X86						= 0x1200,
 	B_CPU_CYRIX_GXm						= 0x1254,