diff --git a/core/lib/multivm/README.md b/core/lib/multivm/README.md
index 5e2af426ae5..f5e8a552242 100644
--- a/core/lib/multivm/README.md
+++ b/core/lib/multivm/README.md
@@ -4,3 +4,15 @@ This crate represents a wrapper over several versions of VM that have been used
 glue code that allows switching the VM version based on the externally provided marker while preserving the public
 interface. This crate exists to enable the external node to process breaking upgrades and re-execute all the
 transactions from the genesis block.
+
+## Developer guidelines
+
+### Adding tests
+
+If you want to add unit tests for the VM wrapper, consider the following:
+
+- Whenever possible, make tests reusable; declare test logic in the [`testonly`](src/versions/testonly/mod.rs) module,
+  and then instantiate tests using this logic for the supported VM versions. If necessary, extend the tested VM trait so
+  that test logic can be defined in a generic way. See the `testonly` module docs for more detailed guidelines.
+- Do not use an RNG where it can be avoided (e.g., for test contract addresses).
+- Avoid using zero / default values in cases they can be treated specially by the tested code.
diff --git a/core/lib/multivm/src/versions/README.md b/core/lib/multivm/src/versions/README.md
deleted file mode 100644
index 01c57509197..00000000000
--- a/core/lib/multivm/src/versions/README.md
+++ /dev/null
@@ -1,17 +0,0 @@
-# MultiVM dependencies
-
-This folder contains the old versions of the VM we have used in the past. The `multivm` crate uses them to dynamically
-switch the version we use to be able to sync from the genesis. This is a temporary measure until a "native" solution is
-implemented (i.e., the `vm` crate would itself know the changes between versions, and thus we will have only the
-functional diff between versions, not several fully-fledged VMs).
-
-## Versions
-
-| Name                   | Protocol versions | Description                                                           |
-| ---------------------- | ----------------- | --------------------------------------------------------------------- |
-| vm_m5                  | 0 - 3             | Release for the testnet launch                                        |
-| vm_m6                  | 4 - 6             | Release for the mainnet launch                                        |
-| vm_1_3_2               | 7 - 12            | Release 1.3.2 of the crypto circuits                                  |
-| vm_virtual_blocks      | 13 - 15           | Adding virtual blocks to help with block number / timestamp migration |
-| vm_refunds_enhancement | 16 - 17           | Fixing issue related to refunds in VM                                 |
-| vm_boojum_integration  | 18 -              | New Proving system (boojum), vm version 1.4.0                         |
diff --git a/core/lib/multivm/src/versions/testonly/mod.rs b/core/lib/multivm/src/versions/testonly/mod.rs
index 7e60f7a6d61..838ba98a9aa 100644
--- a/core/lib/multivm/src/versions/testonly/mod.rs
+++ b/core/lib/multivm/src/versions/testonly/mod.rs
@@ -6,6 +6,8 @@
 //!   (`vm_latest`) and the fast VM (`vm_fast`).
 //! - Submodules of this module define test functions generic by `TestedVm`. Specific VM versions implement `TestedVm`
 //!   and can create tests based on these test functions with minimum amount of boilerplate code.
+//! - Tests use [`VmTester`] built using [`VmTesterBuilder`] to create a VM instance. This allows to set up storage for the VM,
+//!   custom [`SystemEnv`] / [`L1BatchEnv`], deployed contracts, pre-funded accounts etc.
 
 use ethabi::Contract;
 use once_cell::sync::Lazy;