diff --git a/mongox/errors/malformed.go b/mongox/errors/malformed.go
new file mode 100644
index 0000000..113a8a3
--- /dev/null
+++ b/mongox/errors/malformed.go
@@ -0,0 +1,16 @@
+package errors
+
+import "fmt"
+
+// Malformed error
+type Malformed string
+
+// Error message
+func (m Malformed) Error() string {
+	return fmt.Sprintf("Malformed, %s", string(m))
+}
+
+// Malformedf creates an instance of Malformed
+func Malformedf(format string, params ...interface{}) error {
+	return Malformed(fmt.Sprintf(format, params...))
+}