diff --git a/docs/design_docs/proxy.md b/docs/design_docs/proxy.md
index 540d74631b..48e7592059 100644
--- a/docs/design_docs/proxy.md
+++ b/docs/design_docs/proxy.md
@@ -492,7 +492,7 @@ type Cache interface {
 
 - GetPartition
 
-  GetPartition returns the partition ID of specific partition and collection;
+  GetPartition returns the partition ID of a specific partition and collection;
 
 - GetCollectionSchema