diff --git a/ledger/register.go b/ledger/register.go
index 2056fbc..062c07b 100644
--- a/ledger/register.go
+++ b/ledger/register.go
@@ -7,6 +7,10 @@ import (
 
 type Register map[string]Balances
 
+func (register Register) PushAll(other Register) {
+	TODO
+}
+
 func (register Register) Names() []string {
 	names := map[string]int{}
 	for _, v := range register {