diff --git a/doc/nvmf_tracing.md b/doc/nvmf_tracing.md
index a7994fea9..796f560c1 100644
--- a/doc/nvmf_tracing.md
+++ b/doc/nvmf_tracing.md
@@ -50,7 +50,7 @@ an example usage of perf to send I/Os to the NVMe-oF target over an RDMA network
 interface for 10 minutes.
 
 ~~~bash
-./perf -q 128 -s 4096 -w randread -t 600 -r 'trtype:RDMA adrfam:IPv4 traddr:192.168.100.2 trsvcid:4420'
+./perf -q 128 -o 4096 -w randread -t 600 -r 'trtype:RDMA adrfam:IPv4 traddr:192.168.100.2 trsvcid:4420'
 ~~~
 
 The spdk_trace program can be found in the app/trace directory.  To analyze the tracepoints on the same
@@ -142,7 +142,7 @@ build/bin/spdk_trace_record -q -s nvmf -p 24147 -f /tmp/spdk_nvmf_record.trace
 Also send I/Os to the SPDK target application to generate events by previous perf example for 10 minutes.
 
 ~~~bash
-./perf -q 128 -s 4096 -w randread -t 600 -r 'trtype:RDMA adrfam:IPv4 traddr:192.168.100.2 trsvcid:4420'
+./perf -q 128 -o 4096 -w randread -t 600 -r 'trtype:RDMA adrfam:IPv4 traddr:192.168.100.2 trsvcid:4420'
 ~~~
 
 After the completion of perf example, shut down spdk_trace_record by signal SIGINT (Ctrl + C).