diff --git a/docs/developer_guides/appendix_b_api_reference.md b/docs/developer_guides/appendix_b_api_reference.md
index fe27cb4f81..dbb580120e 100644
--- a/docs/developer_guides/appendix_b_api_reference.md
+++ b/docs/developer_guides/appendix_b_api_reference.md
@@ -554,7 +554,7 @@ message LoadPartitionsRequest {
 }
 ```
 
-**parition_names** is a list of parition_name. These partitions in collection with the **collection_name** are going to be loaded to memory.
+**partition_names** is a list of partition_name. These partitions in collection with the **collection_name** are going to be loaded to memory.
 
 **Returns:**
 
@@ -596,7 +596,7 @@ message ReleasePartitionsRequest {
 }
 ```
 
-**parition_names** is a list of parition_name. These partitions in collection with the **collection_name** are going to be released from memory.
+**partition_names** is a list of partition_name. These partitions in collection with the **collection_name** are going to be released from memory.
 
 **Returns:**