diff --git a/docs/developer_guides/appendix_b_api_reference.md b/docs/developer_guides/appendix_b_api_reference.md
index c28ca8fed9343d78526cc283a28d249e0f6d40d8..5456a37e0a560e1b4f90ffa0e25b499df42302f1 100644
--- a/docs/developer_guides/appendix_b_api_reference.md
+++ b/docs/developer_guides/appendix_b_api_reference.md
@@ -196,7 +196,7 @@ message BoolResponse {
 }
 ```
 
-**status** represents the server error code. It doesn't contain grpc error but contains the server error code. We can get the executing result in common status. **error_code** is an enum type to distinguish the executing error type. The total Errorcode is shown in the last of this code. And the **reason** field is a string to describes the detailed error.
+**status** represents the server error code. It doesn't contain grpc error but contains the server error code. We can get the executing result in common status. **error_code** is an enum type to distinguish the executing error type. The total Errorcode is shown in the last of this code. And the **reason** field is a string to describe the detailed error.
 
 **value** represents whether the collection exists. If collection exists, value will be true. If collection doesn't exist, value will be false.
 
@@ -239,7 +239,7 @@ message Status {
 }
 ```
 
-**Status** represents the server error code. It doesn't contain grpc error but contains the server error code. We can get the executing result in common status. **error_code** is an enum type to distinguish the executing error type. The total Errorcode is shown in the last of this code. And the **reason** field is a string to describes the detailed error.
+**Status** represents the server error code. It doesn't contain grpc error but contains the server error code. We can get the executing result in common status. **error_code** is an enum type to distinguish the executing error type. The total Errorcode is shown in the last of this code. And the **reason** field is a string to describe the detailed error.
 
 ###### 3.1.5 ReleaseCollection
 
@@ -280,7 +280,7 @@ message Status {
 }
 ```
 
-**Status** represents the server error code. It doesn't contain grpc error but contains the server error code. We can get the executing result in common status. **error_code** is an enum type to distinguish the executing error type. The total Errorcode is shown in the last of this code. And the **reason** field is a string to describes the detailed error.
+**Status** represents the server error code. It doesn't contain grpc error but contains the server error code. We can get the executing result in common status. **error_code** is an enum type to distinguish the executing error type. The total Errorcode is shown in the last of this code. And the **reason** field is a string to describe the detailed error.
 
 ###### 3.1.6 DescribeCollection
 
@@ -323,7 +323,7 @@ message DescribeCollectionResponse {
 }
 ```
 
-**status** represents the server error code. It doesn't contain grpc error but contains the server error code. We can get the executing result in common status. **error_code** is an enum type to distinguish the executing error type. The total Errorcode is shown in the last of this code. And the **reason** field is a string to describes the detailed error.
+**status** represents the server error code. It doesn't contain grpc error but contains the server error code. We can get the executing result in common status. **error_code** is an enum type to distinguish the executing error type. The total Errorcode is shown in the last of this code. And the **reason** field is a string to describe the detailed error.
 
 **schema** is collection schema same as the collection schema in [CreateCollection](#311-createcollection).