backwards compatibility.

filecoin-project · Jan 9, 2023 · 75b22a6 · 75b22a6
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diff --git a/FIPS/fip-0055.md b/FIPS/fip-0055.md
@@ -349,7 +349,10 @@ We forecast these rough steps to conduct the transition:
 
 ## Backwards Compatibility
 
-Backwards compatibility is not affected, as this FIP introduces strictly additive features.
+On a functional level, backwards compatibility is not affected, as this FIP introduces strictly additive features.
+However, implementing this FIP will require built-in actor changes.
+We expect the CodeCIDs of all built-in actors to be altered, as a consequence of the new and adjusted logic.
+The new actor code will need to be linked in the System actor, and the CodeCID of all existing actors in the state tree will need to be patched to their new counterparts.
 
 ## Test Cases