diff --git a/docs/en/maintain/diagnose.md b/docs/en/maintain/diagnose.md
index 15e735438688c5a09497d32b1719dd03116d2172..d95dd09aab88a6dfacc4b0e107af2a7f3f713b20 100644
--- a/docs/en/maintain/diagnose.md
+++ b/docs/en/maintain/diagnose.md
@@ -74,7 +74,7 @@ There are some advanced options can be specified as below:
 - --log_dir: Specific the output dir. It will print to stdout if not set
 - --env: If the cluster is started with `start-all.sh` script, `onebox` should be setted.
 
-For instance, we can check `conf` only and print the ouput to local dir as below:
+For instance, we can check `conf` only and print the output to local dir as below:
 ```
 openmldb_tool --dist_conf=/tmp/cluster_dist.yml --check=conf --log_dir=./
 ```