diff --git a/sdk/xtdk/potypes.h b/sdk/xtdk/potypes.h
index 5249685..dc4140d 100644
--- a/sdk/xtdk/potypes.h
+++ b/sdk/xtdk/potypes.h
@@ -14,6 +14,7 @@
 #include <ketypes.h>
 
 
+/* Processor performance scale factor */
 #define POWER_PERFORMANCE_SCALE                     100