1 files changed, 6 insertions, 0 deletions
diff --git a/sysfile.c b/sysfile.c
index 9de3d86..e6d08e8 100644
--- a/sysfile.c
+++ b/sysfile.c
@@ -1,3 +1,9 @@
+//
+// File-system system calls.
+// Mostly argument checking, since we don't trust
+// user code, and calls into file.c and fs.c.
+//
+
 #include "types.h"
 #include "defs.h"
 #include "param.h"