usememos
diff --git a/‎proto/api/v1/memo_service.proto
+1-1 b/‎proto/api/v1/memo_service.proto
+1-1
@@ -232,7 +232,7 @@ message ListMemosResponse {
 
   // A token, which can be sent as `page_token` to retrieve the next page.
   // If this field is omitted, there are no subsequent pages.
-  string next_page_token = 2;
+  optional string next_page_token = 2;
 }
 
 message GetMemoRequest {
Original file line number	Diff line number	Diff line change
`@@ -232,7 +232,7 @@ message ListMemosResponse {`
`232`	`232`
`233`	`233`	// A token, which can be sent as `page_token` to retrieve the next page.
`234`	`234`	`// If this field is omitted, there are no subsequent pages.`
`235`		`- string next_page_token = 2;`
	`235`	`+ optional string next_page_token = 2;`
`236`	`236`	`}`
`237`	`237`
`238`	`238`	`message GetMemoRequest {`