diff --git a/google/internal/externalaccount/sts_exchange.go b/google/internal/externalaccount/sts_exchange.go
index cc2c99a..d7f54e0 100644
--- a/google/internal/externalaccount/sts_exchange.go
+++ b/google/internal/externalaccount/sts_exchange.go
@@ -85,7 +85,7 @@ type STSTokenExchangeRequest struct {
 	SubjectTokenType   string
 }
 
-// STSTokenExchangeResponse is used to decode the remote server's response during an oauth2 token exchange.
+// STSTokenExchangeResponse is used to decode the remote server response during an oauth2 token exchange.
 type STSTokenExchangeResponse struct {
 	AccessToken     string `json:"access_token"`
 	IssuedTokenType string `json:"issued_token_type"`