Update release-notes-v4.x-draft.md

docs/release-notes/release-notes-v4.x-draft.md

@@ -5,6 +5,7 @@ v4.x Release notes
 
 - [v4.0](#v40)
   * [How to Upgrade](#how-to-upgrade)
+    + [Clean Install](#Clean-Install)
   * [Notable Changes](#notable-changes)
     + [Node and Chain](#node-and-chain)
     + [Wallet changes](#wallet-changes)
@@ -18,6 +19,9 @@ v4.x Release notes
   When upgrading to this version from **hsd v3.x** you must pass `--chain-migrate=3` when you run it for the first time.
   If you are upgrading from **hsd v2.x**, then you also need to pass `--wallet-migrate=1`.
 
+### Clean Install
+  - Delete first ./hsd folder, disclaimer: you will lose everything. Then run: git clone --depth 1 --branch 4.x https://github.com/handshake-org/hsd.git command.
+
 ## Notable Changes
 ### Urkel Tree Compaction
   `FullNode` parses new configuration option `--compact-tree-on-init` and `--compact-tree-init-interval` which will compact the Urkel Tree when the node first opens, by deleting historical data. It will try to compact it again after `tree-init-interval` has passed. Compaction will keep up to the last 288 blocks worth of tree data on disk (7-8 tree intervals) exposing the node to a similar deep reorganization vulnerability as a chain-pruning node. [#669](https://github.com/handshake-org/hsd/pull/669)