diff --git a/result.go b/result.go
index <HASH>..<HASH> 100644
--- a/result.go
+++ b/result.go
@@ -48,6 +48,7 @@ type (
 		Value() interface{}
 		SetDetails(ErrorDetails)
 		Details() ErrorDetails
+		String() string
 	}
 
 	// ResultErrorFields holds the fields for each ResultError implementation.
Add String() to ResultError interface