Add description about enable auto detect thread number when

Cc: Liming Gao <>
Cc: Michael Kinney <>
Cc: Kevin W Shaw <>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yonghong Zhu <>
 5_meta-data_file_specifications/ | 5 +++--
 appendix_d_buildexe_command/               | 3 +--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/5_meta-data_file_specifications/ 
index ff8c2ec..4481ee9 100644
--- a/5_meta-data_file_specifications/
+++ b/5_meta-data_file_specifications/
@@ -117,12 +117,13 @@ specified in this file and it is not specified using the 
`-t` option on the
 command-line, then the build will break.
 The number of concurrent threads. The default, if not specified or set to zero,
-is 2 Recommend setting this value to one more than the number of computer cores
-or CPUs of the development workstation.
+tool automatically detect number of processor threads. Recommend setting this
+value to one more than the number of computer cores or CPUs of the development
 Specify the file name to use for the build rules that are followed when
 generating Makefiles. If not specified, the file:
diff --git a/appendix_d_buildexe_command/ 
index 3dbfc33..71de3eb 100644
--- a/appendix_d_buildexe_command/
+++ b/appendix_d_buildexe_command/
@@ -60,12 +60,11 @@ Options:
   -x SKUID, --sku-id=SKUID
                         Using this name of SKU ID to build the platform,
                         overriding SKUID_IDENTIFIER in DSC file.
   -n THREADNUMBER       Build the platform using multi-threaded compiler. The
                         value overrides target.txt's
-                        MAX_CONCURRENT_THREAD_NUMBER. Less than 2 will disable
-                        multi-thread builds.
+                        MAX_CONCURRENT_THREAD_NUMBER.
   -f FDFFILE, --fdf=FDFFILE
                         The name of the FDF file to use, which overrides the
                         setting in the DSC file.
   -r ROMIMAGE, --rom-image=ROMIMAGE
                         The name of FD to be generated. The name must be from

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