diff --git a/kernel/include/sortix/fcntl.h b/kernel/include/sortix/fcntl.h
index 64127cd1..d3f8a0ec 100644
--- a/kernel/include/sortix/fcntl.h
+++ b/kernel/include/sortix/fcntl.h
@@ -29,8 +29,8 @@
 
 __BEGIN_DECLS
 
-// Remember to update the flag classifications at the top of descriptor.cpp if
-// you add new flags here.
+/* Remember to update the flag classifications at the top of descriptor.cpp if
+   you add new flags here. */
 #define O_READ (1<<0)
 #define O_WRITE (1<<1)
 #define O_EXEC (1<<2)