diff --git a/build/alt/proto b/build/alt/proto
index fafdbca..0e135fe 100644
--- a/build/alt/proto
+++ b/build/alt/proto
@@ -3,7 +3,7 @@
 # This one has . and .. but no dd directory entries
 #
 # Entries are one of:
-#    filename f[r-][w-][r-][w-] uid local_file_to_insert
+#    filename f[r-][w-][r-][w-] uid local_file_to_insert [inumber]
 #    dirname  d[r-][w-][r-][w-] uid [inumber]
 #    device   i[r-][w-][r-][w-] uid inumber
 #    link     l---- inumber
@@ -14,6 +14,7 @@
 # Format was inspired by 6th Edition mkfs
 #
 / 	         drwr- -1 2
+    core         frwrw -1 /dev/null 1
     system       drwr- -1 3
         ttyin    irwr- -1 6
         keyboard irwr- -1 7
@@ -35,6 +36,7 @@
         ls       frwr- -1 bin/altls
         mkdir    frwr- -1 bin/altmkdir
         mv       frwr- -1 bin/mv
+        od       frwr- -1 bin/od
 	password frw-- -1 fs/password
         sh       frwr- -1 bin/sh
         stat     frwr- -1 bin/stat