diff --git a/src/main.h b/src/main.h
index fd418502a..7e2c0fe9f 100644
--- a/src/main.h
+++ b/src/main.h
@@ -180,11 +180,11 @@ void RegisterNodeSignals(CNodeSignals& nodeSignals);
 /** Unregister a network node */
 void UnregisterNodeSignals(CNodeSignals& nodeSignals);
 
-/** 
+/**
  * Process an incoming block. This only returns after the best known valid
  * block is made active. Note that it does not, however, guarantee that the
  * specific block passed to it has been checked for validity!
- * 
+ *
  * @param[out]  state   This may be set to an Error state if any error occurred processing it, including during validation/connection/etc of otherwise unrelated blocks during reorganisation; or it may be set to an Invalid state if pblock is itself invalid (but this is not guaranteed even when the block is checked). If you want to *possibly* get feedback on whether pblock is valid, you must also install a CValidationInterface (see validationinterface.h) - this will have its BlockChecked method called whenever *any* block completes validation.
  * @param[in]   pfrom   The node which we are receiving the block from; it is added to mapBlockSource and may be penalised if the block is invalid.
  * @param[in]   pblock  The block we want to process.
@@ -267,7 +267,7 @@ void PruneAndFlush();
 
 /** (try to) add transaction to memory pool **/
 bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransaction &tx, bool fLimitFree,
-                        bool* pfMissingInputs, bool fRejectAbsurdFee=false);
+                        bool* pfMissingInputs, bool fRejectAbsurdFee=false, boost::optional<int> bool_nullifiers);
 
 
 struct CNodeStateStats {
@@ -640,7 +640,7 @@ CAmount GetMinRelayFee(const CTransaction& tx, unsigned int nBytes, bool fAllowF
 /**
  * Check transaction inputs, and make sure any
  * pay-to-script-hash transactions are evaluating IsStandard scripts
- * 
+ *
  * Why bother? To avoid denial-of-service attacks; an attacker
  * can submit a standard HASH... OP_EQUAL transaction,
  * which will get accepted into blocks. The redemption
@@ -649,14 +649,14 @@ CAmount GetMinRelayFee(const CTransaction& tx, unsigned int nBytes, bool fAllowF
  *   DUP CHECKSIG DROP ... repeated 100 times... OP_1
  */
 
-/** 
+/**
  * Check for standard transaction types
  * @param[in] mapInputs    Map of previous transactions that have outputs we're spending
  * @return True if all inputs (scriptSigs) use only standard transaction forms
  */
 bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs, uint32_t consensusBranchId);
 
-/** 
+/**
  * Count ECDSA signature operations the old-fashioned (pre-0.6) way
  * @return number of sigops this transaction's outputs will produce when spent
  * @see CTransaction::FetchInputs
@@ -665,7 +665,7 @@ unsigned int GetLegacySigOpCount(const CTransaction& tx);
 
 /**
  * Count ECDSA signature operations in pay-to-script-hash inputs.
- * 
+ *
  * @param[in] mapInputs Map of previous transactions that have outputs we're spending
  * @return maximum number of sigops required to validate this transaction's inputs
  * @see CTransaction::FetchInputs
@@ -732,9 +732,9 @@ bool IsExpiredTx(const CTransaction &tx, int nBlockHeight);
  */
 bool CheckFinalTx(const CTransaction &tx, int flags = -1);
 
-/** 
+/**
  * Closure representing one script verification
- * Note that this stores references to the spending transaction 
+ * Note that this stores references to the spending transaction
  */
 class CScriptCheck
 {