diff --git a/merkledag.go b/merkledag.go
index fa7dc4f..cb2ff3c 100644
--- a/merkledag.go
+++ b/merkledag.go
@@ -3,7 +3,6 @@ package format
 import (
 	"context"
 	"errors"
-	"fmt"
 
 	cid "github.com/ipfs/go-cid"
 )
@@ -21,10 +20,10 @@ type ErrNotFound struct {
 // message for this error.
 func (e ErrNotFound) Error() string {
 	if e.Cid == cid.Undef {
-		return "node not found"
+		return "ipld: could not find node"
 	}
 
-	return fmt.Sprintf("%s not found", e.Cid)
+	return "ipld: could not find " + e.Cid.String()
 }
 
 // Is allows to check whether any error is of this ErrNotFound type.
diff --git a/version.json b/version.json
index 9ed87d7..372b6ea 100644
--- a/version.json
+++ b/version.json
@@ -1,3 +1,3 @@
 {
-  "version": "v0.3.1"
+  "version": "v0.4.0"
 }