diff --git a/docs/developer_guides/chap05_proxy.md b/docs/developer_guides/chap05_proxy.md
index 50827bf8c6..96b4c94b43 100644
--- a/docs/developer_guides/chap05_proxy.md
+++ b/docs/developer_guides/chap05_proxy.md
@@ -570,7 +570,7 @@ func NewTaskScheduler(ctx context.Context, idAllocator *allocator.IDAllocator, t
 
 _scheduleDdTask()_ selects tasks in a FIFO manner, thus time order is guaranteed.
 
-The policy of _scheduleDmTask()_ should target on throughput, not tasks' time order. Note that the time order of the tasks' execution will later be garanteed by the timestamp & time tick mechanism.
+The policy of _scheduleDmTask()_ should target on throughput, not tasks' time order. Note that the time order of the tasks' execution will later be guaranteed by the timestamp & time tick mechanism.
 
 The policy of _scheduleDqTask()_ should target on throughput. It should also take visibility into consideration. For example, if an insert task and a query arrive in a same time tick and the query comes after insert, the query should be scheduled in the next tick thus the query can see the insert.