diff --git a/docs/source/manual/openfpga_shell/openfpga_commands/fpga_bitstream_commands.rst b/docs/source/manual/openfpga_shell/openfpga_commands/fpga_bitstream_commands.rst
index a63717e15..12c4d8ff5 100644
--- a/docs/source/manual/openfpga_shell/openfpga_commands/fpga_bitstream_commands.rst
+++ b/docs/source/manual/openfpga_shell/openfpga_commands/fpga_bitstream_commands.rst
@@ -69,6 +69,15 @@ write_fabric_bitstream
     Specify the file format [``plain_text`` | ``xml``]. By default is ``plain_text``.
     See file formats in :ref:`file_formats_fabric_bitstream_xml` and :ref:`file_formats_fabric_bitstream_plain_text`.
 
+  .. option:: --fast_configuration
+
+    Reduce the bitstream size when outputing by skipping dummy configuration bits. It is applicable to configuration chain, memory bank and frame-based configuration protocols. For configuration chain, when enabled, the zeros at the head of the bitstream will be skipped. For memory bank and frame-based, when enabled, all the zero configuration bits will be skipped. So ensure that your memory cells can be correctly reset to zero with a reset signal. 
+   
+    .. warning:: Fast configuration is only applicable to plain text file format!
+
+    .. note:: If both reset and set ports are defined in the circuit modeling for programming, OpenFPGA will pick the one that will bring largest benefit in speeding up configuration.
+
+
   .. option:: --verbose
 
     Show verbose log