Index: abi/include/abi/syscall.h
===================================================================
--- abi/include/abi/syscall.h	(revision b3c185b62f0fa507e9d72bce104161ccdb4b3d57)
+++ abi/include/abi/syscall.h	(revision 84876aa4f80a43fe7bb9c01fbe376d900db1cbe4)
@@ -36,4 +36,10 @@
 #define _ABI_SYSCALL_H_
 
+/** System calls.
+ *
+ * If you are adding or removing syscalls, or changing the number of
+ * their arguments, please update syscall description table
+ * in @c uspace/app/trace/syscalls.c
+ */
 typedef enum {
 	SYS_KIO = 0,