diff --git a/docs/build-and-run.md b/docs/build-and-run.md
index 1b387d65a..599f75285 100644
--- a/docs/build-and-run.md
+++ b/docs/build-and-run.md
@@ -30,7 +30,7 @@ bash build.sh release --init --make
 
 ## Run
 
-Now that you built the `observer` binary, you can deploy a OceanBase instance with the `obd.sh` utility:
+Now that you built the `observer` binary, you can deploy an OceanBase instance with the `obd.sh` utility:
 
 ```shell
 ./tools/deploy/obd.sh prepare -p /tmp/obtest