Update doc after review
#### Why It May Be Needed
-- Removing tokens need of mechanism of painless way. Transaction freeze ledgers give a security transition. Transaction Freeze Ledgers disable specific ledgers (system ignore frozen ledgers).
+- Removing of deprecated ledgers need of painless mechanism. Transaction freeze ledgers give a security transition. Transaction Freeze Ledgers disable specific ledgers (system ignore frozen ledgers).
+Some ledgers can become deprecated and outdated. By means of auth map we could prohibit actions with these ledgers. Cons of this approach:
+- it will not be obvious to the user that the ledger is out of date and why the transactions stopped being recorded
+- the ledger can be returned to work, which in view of the long downtime can cause technical and business issues.
+- the ledger cannot be removed from the system and will require to spend money on resource allocation and support of the outdated database.
+To get rid of these drawbacks, a ledger freeze transaction was created. It allows to completely freeze the ledger and remove it depending on the steward's desire.
#### Transaction Freeze Ledgers (TFL)
- LEDGERS_FREEZE is transaction for add specific ledgers to list of frozen ledgers.
+- Frozen ledgers can't be unfreeze. After freeze you can delete frozen ledger via [remove_ledger.py] (https://github.com/hyperledger/indy-node/blob/master/scripts/remove_ledger.py).
+
+- Base ledgers POOL, CONFIG, AUDIT and DOMAIN can't be frozen.
+
- Every transaction LEDGERS_FREEZE consists of a list ledgers ids, unique version.
- It's possible to get the whole list of frozen ledgers via transaction GET_FROZEN_LEDGERS.
- See [hyperledger/README.md](https://github.com/esplinr/indy-hipe/blob/master/text/0162-frozen-ledgers/README.md) and [sovrin/README.md](https://github.com/esplinr/indy-hipe/blob/sovrin-sip/text/5005-token-removal/README.md) for details.
+
+#### How it affects the system
+
+- Frozen ledgers are not catched up (because the LEDGERS_FREEZE transaction is part of the config ledger, which is applied before additional ledgers).
+
+- Do not check, do not send new batches to update frozen ledgers.
+
+- Recording continues in audit transactions, but without using real ledgers and using data about frozen ledgers from the config state.
+
+- Any transactions to frozen ledgers are forbidden.
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