restore tabfs.c note; reword md

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/tabfs.c b/fs/tabfs.c
index 5c27faf..aeb55f3 100644
--- a/fs/tabfs.c
+++ b/fs/tabfs.c
@@ -1,3 +1,9 @@
+// This file should rarely need to be changed. (which is intentional,
+// because it is a pain to program here, it's a pain to recompile and
+// reload it, and it's a pain to debug it.)  Most of the behavior of
+// TabFS -- the definitions of the synthetic files -- lives on the
+// extension side, not here.
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>