diff --git a/tla/consensus/MCccfraft.cfg b/tla/consensus/MCccfraft.cfg
index ce630df2b577..61acf564d01f 100644
--- a/tla/consensus/MCccfraft.cfg
+++ b/tla/consensus/MCccfraft.cfg
@@ -77,6 +77,7 @@ INVARIANTS
     NoLeaderInTermZeroInv
     MatchIndexLowerBoundNextIndexInv
     CommitCommittableIndices
+    CommittableIndicesAreKnownSignaturesInv
     \* DebugInvLeaderCannotStepDown
     \* DebugInvAnyCommitted
     \* DebugInvAllCommitted
diff --git a/tla/consensus/MCccfraftWithReconfig.cfg b/tla/consensus/MCccfraftWithReconfig.cfg
index 914298be1e05..c53bf13bc2d3 100644
--- a/tla/consensus/MCccfraftWithReconfig.cfg
+++ b/tla/consensus/MCccfraftWithReconfig.cfg
@@ -77,6 +77,7 @@ INVARIANTS
     NoLeaderInTermZeroInv
     MatchIndexLowerBoundNextIndexInv
     CommitCommittableIndices
+    CommittableIndicesAreKnownSignaturesInv
     \* DebugInvLeaderCannotStepDown
     \* DebugInvAnyCommitted
     \* DebugInvAllCommitted