diff --git a/pkg/pmapi/messages.go b/pkg/pmapi/messages.go
index f2c8ddd4..723a4ba6 100644
--- a/pkg/pmapi/messages.go
+++ b/pkg/pmapi/messages.go
@@ -141,7 +141,7 @@ const (
 // Due to API limitations, we shouldn't make requests with more than 100 message IDs at a time.
 const messageIDPageSize = 100
 
-// ConversationIDDomain is used as a placeholder for conversation reference headers to improve compatibility with various clients
+// ConversationIDDomain is used as a placeholder for conversation reference headers to improve compatibility with various clients.
 const ConversationIDDomain = `protonmail.conversationid`
 
 // InternalIDDomain is used as a placeholder for reference/message ID headers to improve compatibility with various clients