diff --git a/scripts/fork-test/README.md b/scripts/fork-test/README.md
new file mode 100644
index 000000000..d8b7eaace
--- /dev/null
+++ b/scripts/fork-test/README.md
@@ -0,0 +1,60 @@
+# Fork testing
+
+## Overview
+
+
+## Requirements: 
+
+* node.js + npm
+* `apt install -y moreutils jq`
+
+## Testing testnet
+
+1. Check current testnet version.
+2. Checkout repository for this version. For example, if testnet has runtime in version `v14.0.1`, checkout tag `v14.0.1`
+3. Build binary with embedded testnet runtime: `cargo build --release -F testnet-runtime`:
+   * copy it to tmp to make it easier: `cp ./target/release/substrate /tmp/liberland-testnet-v14.0.1`
+4. Download runtime you want to test from [GitHub Releases](https://github.com/liberland/liberland_substrate/releases)
+   * copy it to tmp to make it easier:  `cp bastiat-v15.0.0.wasm /tmp/bastiat-v15.0.0.wasm`
+   * if building runtime yourself, make sure you're on correct branch and you pass `-F testnet-runtime` to cargo
+5. Checkout repository for version you want to test. For example, if we're testing runtime `v15.0.0`, checkout tag `v15.0.0`.
+6. Make sure you're not running another instance of Liberland Network - port 9944 should be free.
+7. Run the forked network:
+   ```sh
+   cd scripts/fork-test/
+   export BINARY=/tmp/liberland-testnet-v14.0.1
+   export RUNTIME=/tmp/bastiat-v15.0.0.wasm
+   ./test.sh bastiat.config.sh
+   ```
+8. Test the chain: https://polkadot.js.org/apps/?rpc=ws://localhost:9944
+   * this chain has the same storage as Testnet at the time the test was run - the only differences is that there's only one validator: Alice
+   * it should be producing blocks
+   * when exploring chain state, you shouldn't see any `<unknown>` values - this suggests some migration is missing
+
+## Testing mainnet
+
+1. Check current mainnet version.
+2. Download the binary with the same version as one running currently on mainnet from [GitHub Releases](https://github.com/liberland/liberland_substrate/releases)
+   * copy it to tmp to make it easier: `cp linux_x86_build /tmp/liberland-mainnet-v13.0.0`
+4. Download runtime you want to test from [GitHub Releases](https://github.com/liberland/liberland_substrate/releases) - it will be a different version than the binary!
+   * copy it to tmp to make it easier:  `cp mainnet-v15.0.0.wasm /tmp/mainnet-v15.0.0.wasm`
+   * if building runtime yourself, make sure you're on correct branch
+5. Checkout repository for version you want to test. For example, if we're testing runtime `v15.0.0`, checkout tag `v15.0.0`.
+6. Make sure you're not running another instance of Liberland Network - port 9944 should be free.
+7. Run the forked network:
+   ```sh
+   cd scripts/fork-test/
+   export BINARY=/tmp/liberland-mainnet-v13.0.0
+   export RUNTIME=/tmp/mainnet-v15.0.0.wasm
+   ./test.sh mainnet.config.sh
+   ```
+8. Test the chain: https://polkadot.js.org/apps/?rpc=ws://localhost:9944
+   * this chain has the same storage as mainnet at the time the test was run - the only differences is that there's only one validator: Alice
+   * it should be producing blocks
+   * when exploring chain state, you shouldn't see any `<unknown>` values - this suggests some migration is missing
+
+## Example error
+
+Below is a screenshot of an error found by fork-testing. It hows that after the runtime upgrade old company request data became unparsable - indicating a missing migration for existing data.
+
+![error](error.png)
\ No newline at end of file
diff --git a/scripts/fork-test/error.png b/scripts/fork-test/error.png
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diff --git a/scripts/fork-test/test.sh b/scripts/fork-test/test.sh
index 606885ff1..3c2985189 100755
--- a/scripts/fork-test/test.sh
+++ b/scripts/fork-test/test.sh
@@ -1,7 +1,6 @@
 #!/bin/bash
 
 # Requirements: 
-# * cargo capable of building substrate
 # * node.js + npm
 # * apt install -y moreutils jq
 #
@@ -22,7 +21,7 @@ npm install
 mkdir -p data
 cp "$BINARY" data/binary
 cp "$RUNTIME" data/runtime.wasm
-rm -f data/fork.json
+rm -f data/fork.json data/storage.json
 
 # Build new spec
 npm start