Index: abi/include/abi/syscall.h
===================================================================
--- abi/include/abi/syscall.h	(revision 8f57fb2f6ab4693749e4dedbe0b1ab800ba9c40a)
+++ abi/include/abi/syscall.h	(revision 6fa3a038324f471e7b8de39b911143f88f24f139)
@@ -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,