diff --git a/repl/evaluator.go b/repl/evaluator.go
index d8cb1aac..799e9458 100644
--- a/repl/evaluator.go
+++ b/repl/evaluator.go
@@ -711,7 +711,7 @@ func newExtensionOption(extType string) (*extensionOption, error) {
 	case "encoders":
 		extOption = ext.Encoders()
 	default:
-		return nil, fmt.Errorf("Unknown option: %s. Available options are: ['strings', 'protos', 'math', 'encoders', 'all']", op)
+		return nil, fmt.Errorf("Unknown option: %s. Available options are: ['bindings', 'optional', 'strings', 'protos', 'math', 'encoders', 'all']", op)
 	}
 
 	return &extensionOption{extensionType: extType, option: extOption}, nil
diff --git a/repl/evaluator_test.go b/repl/evaluator_test.go
index 70a3044a..415fe36c 100644
--- a/repl/evaluator_test.go
+++ b/repl/evaluator_test.go
@@ -864,7 +864,7 @@ func TestProcessOptionError(t *testing.T) {
 					"'bogus'",
 				},
 			},
-			errorMsg: "extension: Unknown option: 'bogus'. Available options are: ['strings', 'protos', 'math', 'encoders', 'all']",
+			errorMsg: "extension: Unknown option: 'bogus'. Available options are: ['bindings', 'optional', 'strings', 'protos', 'math', 'encoders', 'all']",
 		},
 	}