diff --git a/src/validation.cpp b/src/validation.cpp
index 3cd5345de061f5..a5c4e7b79db08b 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -4042,6 +4042,8 @@ bool TestBlockValidity(BlockValidationState& state,
     AssertLockHeld(cs_main);
     assert(pindexPrev && pindexPrev == chainstate.m_chain.Tip());
 
+    // TODO: instead restoring bls_legacy_scheme better to keep it unchanged
+    // Moreover, current implementation won't restore if current function will finish earlier with error
     auto bls_legacy_scheme = bls::bls_legacy_scheme.load();
 
     uint256 hash = block.GetHash();