diff --git a/docs/source/changelog.rst b/docs/source/changelog.rst
index d16cbb4b53..62541eeb50 100644
--- a/docs/source/changelog.rst
+++ b/docs/source/changelog.rst
@@ -77,7 +77,7 @@ Version 4.0
   to register/unregister a java package namespace with an associated owner in the network parameter packageOwnership whitelist.
 
 * BFT-Smart and Raft notary implementations have been move to the ``net.corda.notary.experimental`` package to emphasise
-  their experimental nature.
+  their experimental nature. Note that it not possible to preserve the state for both types of notaries when upgrading from V3 or an earlier Corda version.
 
 * New "validate-configuration" sub-command to `corda.jar`, allowing to validate the actual node configuration without starting the node.