diff --git a/protocol.md b/protocol.md
index 786dad8..55aac1d 100644
--- a/protocol.md
+++ b/protocol.md
@@ -1489,7 +1489,7 @@ interface DidOpenTextDocumentParams {
 }
 ```
 
-_Registration Options_: `TextDocumentRegistrationsOptions`
+_Registration Options_: `TextDocumentRegistrationOptions`
 
 #### <a name="textDocument_didChange"></a>DidChangeTextDocument Notification