diff --git a/args.py b/args.py
index a2f6a81..0c43683 100644
--- a/args.py
+++ b/args.py
@@ -89,8 +89,8 @@
 parser.add_argument("-multisplit", action='store_true', default=False,
                    help="intra-rank thread balance. All pieces of cell on same rank.")
 
-parser.add_argument("-reportmapping",
-                    dest='report_mapping',
+parser.add_argument("-registermapping",
+                    dest='register_mapping',
                     action='store_true',
-                    help="report mapping",
+                    help="write section-segment mapping to gid_3.dat file, used for BBP reporting",
                     default=False)
diff --git a/reference_data/README.md b/reference_data/README.md
index a62d9de..686156e 100644
--- a/reference_data/README.md
+++ b/reference_data/README.md
@@ -6,4 +6,4 @@ integration tests.
 
 * spk1.100ms.std.ref : generated using NEURON (`special -python ringtest.py -tstop 100`) with the contemporary
 `master` commit b55c6e1630665a792ced67c6446ed4fb852c7f79.
-* soma.h5 : generated using CORENEURON (`LIBSONATA_ZERO_BASED_GIDS=1 special -mpi -python ringtest.py -tstop 100 -coreneuron -reportmapping`)
+* soma.h5 : generated using CORENEURON (`LIBSONATA_ZERO_BASED_GIDS=1 special -mpi -python ringtest.py -tstop 100 -coreneuron -registermapping`)
diff --git a/ringtest.py b/ringtest.py
index 73007c7..d195181 100644
--- a/ringtest.py
+++ b/ringtest.py
@@ -160,7 +160,7 @@ def prun(tstop):
             print("Error: multi-split is not supported with CoreNEURON\n")
             quit()
 
-        if args.report_mapping:
+        if args.register_mapping:
             setup_nrnbbcore_register_mapping(rings)
             report_conf_file = "report.conf"
             sim_conf_file = "sim.conf"