diff --git a/contrib/devtools/check-doc.py b/contrib/devtools/check-doc.py
index 57d6b6e8c9..4c27a8ec60 100755
--- a/contrib/devtools/check-doc.py
+++ b/contrib/devtools/check-doc.py
@@ -23,7 +23,7 @@ REGEX_DOC = re.compile(r'HelpMessageOpt\(\"(\-[^\"=]+?)(?:=|\")')
 # list unsupported, deprecated and duplicate args as they need no documentation
 SET_DOC_OPTIONAL = set(['-rpcssl', '-benchmark', '-h', '-help', '-socks', '-tor', '-debugnet', '-whitelistalwaysrelay', '-prematurewitness', '-walletprematurewitness', '-promiscuousmempoolflags', '-blockminsize'])
 
-SET_DOC_OPTIONAL.update(['-con_fpowallowmindifficultyblocks', '-con_fpownoretargeting', '-con_nsubsidyhalvinginterval', '-con_bip34height', '-con_bip65height', '-con_bip66height', '-con_npowtargettimespan', '-con_npowtargetspacing', '-con_nrulechangeactivationthreshold', '-con_nminerconfirmationwindow', '-con_powlimit', '-con_parentpowlimit', '-con_bip34hash', '-con_nminimumchainwork', '-con_defaultassumevalid', '-ndefaultport', '-npruneafterheight', '-fdefaultconsistencychecks', '-frequirestandard', '-fmineblocksondemand', '-mainchainrpccookiefile', '-testnet', '-ct_bits', '-ct_exponent', '-anyonecanspendaremine', '-fminingrequirespeers', '-fmineblocksondemand'])
+SET_DOC_OPTIONAL.update(['-con_fpowallowmindifficultyblocks', '-con_fpownoretargeting', '-con_nsubsidyhalvinginterval', '-con_bip34height', '-con_bip65height', '-con_bip66height', '-con_npowtargettimespan', '-con_npowtargetspacing', '-con_nrulechangeactivationthreshold', '-con_nminerconfirmationwindow', '-con_powlimit', '-con_parentpowlimit', '-con_bip34hash', '-con_nminimumchainwork', '-con_defaultassumevalid', '-parentgenesisblockhash', '-ndefaultport', '-npruneafterheight', '-fdefaultconsistencychecks', '-frequirestandard', '-fmineblocksondemand', '-mainchainrpccookiefile', '-testnet', '-ct_bits', '-ct_exponent', '-anyonecanspendaremine', '-fminingrequirespeers', '-fmineblocksondemand'])
 
 def main():
   used = check_output(CMD_GREP_ARGS, shell=True)
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 4d5b2a25e3..7985073af0 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -129,6 +129,8 @@ protected:
         consensus.nMinimumChainWork = uint256S(GetArg("-con_nminimumchainwork", "0x00"));
         // By default assume that the signatures in ancestors of this block are valid.
         consensus.defaultAssumeValid = uint256S(GetArg("-con_defaultassumevalid", "0x00"));
+        // bitcoin regtest is the parent chain by default
+        parentGenesisBlockHash = uint256S(GetArg("-parentgenesisblockhash", "0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206"));
 
         nDefaultPort = GetArg("-ndefaultport", 7042);
         nPruneAfterHeight = GetArg("-npruneafterheight", 1000);
@@ -163,8 +165,6 @@ public:
         pchMessageStart[2] = 0xb5;
         pchMessageStart[3] = 0xda;
 
-        parentGenesisBlockHash = uint256S("0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206");
-
         // Generate pegged Bitcoin asset
         std::vector<unsigned char> commit = CommitToArguments(consensus, strNetworkID, genesisChallengeScript);
         uint256 entropy;