X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;ds=sidebyside;f=doc%2Fguides%2Ftestpmd_app_ug%2Ftestpmd_funcs.rst;h=4e192294fc4ec84fb683318210299564ecb835bf;hb=acbf77a6907fde331935955ff2a219edae93c3b9;hp=d81298997165c0a658bb53ec7dc579da4784d9b4;hpb=bf56fce1fb45b83747527e6312f61c0fcf3789b8;p=dpdk.git

diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
index d812989971..4e192294fc 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -98,9 +98,11 @@ Start packet forwarding with current configuration::
 start tx_first
 ~~~~~~~~~~~~~~
 
-Start packet forwarding with current configuration after sending one burst of packets::
+Start packet forwarding with current configuration after sending specified number of bursts of packets::
 
-   testpmd> start tx_first
+   testpmd> start tx_first (""|burst_num)
+
+The default burst number is 1 when ``burst_num`` not presented.
 
 stop
 ~~~~