diff --git a/weed-shell.md b/weed-shell.md
index 3fe97cc..0509c86 100644
--- a/weed-shell.md
+++ b/weed-shell.md
@@ -111,7 +111,7 @@ if use see in logs filechunk **2480,09a6290e6159aedd** Not Found:
 ```
 I0212 22:22:56.666094 filechunk_manifest.go:197 read http://fast-volume-1:8080/2480,09a6290e6159aedd failed, err: http://fast-volume-1:8080/2480,09a6290e6159aedd?readDeleted=true: 404 Not Found
 ```
-1. volume.check.disk
+1. `volume.check.disk`
 ```
 > lock; volume.check.disk -v -force -slow -volumeId 2480 -nonRepairThreshold 1 -syncDeleted
 load collection logs-data volume 2480 index size 2621232 from fast-volume-3:8080 ...
@@ -119,7 +119,7 @@ load collection logs-data volume 2480 index size 2621232 from fast-volume-1:8080
 volume 2480 fast-volume-1:8080 has 163827 entries, fast-volume-3:8080 missed 0 and partially deleted 0 entries
 volume 2480 fast-volume-3:8080 has 163827 entries, fast-volume-1:8080 missed 0 and partially deleted 0 entries
 ```
-2. volume.fsck
+2. `volume.fsck`
 Search for files that are in the filler, but there are no chunks on the volume servers
 ```
 lock;volume.fsck -findMissingChunksInFiler -verifyNeedles -collection logs-data -volumeId 2480 -v
@@ -181,7 +181,7 @@ Find the chunk id **2480,09a6290e6159aedd**:
 }chunks 1 meta size: 124 gzip:152
 ```
 
-3. fs.verify
+3. `fs.verify`
 Check the status of all chunks uploaded in the last hour:
 ```
 fs.verify -v -modifyTimeAgo 1h
@@ -190,6 +190,8 @@ total 807944 directories, 121461080 files
 verified 53218 files, error 0 files 
 ```
 
+In this case, you need a local incremental backup via [asynchronous replication](https://github.com/seaweedfs/seaweedfs/wiki/Async-Backup).
+
 # One more trick
 You can skip the "fs." prefix, for all "fs.*" commands:
 ```