diff --git a/docs/source/manual/file_formats/fabric_bitstream.rst b/docs/source/manual/file_formats/fabric_bitstream.rst
index 46a7b852a..2def5d269 100644
--- a/docs/source/manual/file_formats/fabric_bitstream.rst
+++ b/docs/source/manual/file_formats/fabric_bitstream.rst
@@ -43,21 +43,25 @@ The information depends on the type of configuration procotol.
 
 .. option:: memory_bank
 
-  Multiple lines will be included, each of which is organized as <address><space><bits>.
-  Note that due to the use of Bit-Line and Word-Line decoders, every two lines are paired.
-  The first line represents the Bit-Line address and configuration bit.
-  The second line represents the Word-Line address and configuration bit.
+  Multiple lines will be included, each of which is organized as <bl_address><wl_address><bits>.
+  The size of address line and data input bits are shown as a comment in the bitstream file, which eases the development of bitstream downloader.
+  For example 
+  
+  .. code-block:: verilog
+
+    // Bitstream width (LSB -> MSB): <bl_address 5 bits><wl_address 5 bits><data input 1 bits>
+
+  The first part represents the Bit-Line address.
+  The second part represents the Word-Line address.
+  The third part represents the configuration bit.
   For example
    
   .. code-block:: xml
      
-     <bitline_address> <bit_value> 
-     <wordline_address> <bit_value> 
-     <bitline_address> <bit_value> 
-     <wordline_address> <bit_value> 
+     <bitline_address><wordline_address><bit_value> 
+     <bitline_address><wordline_address><bit_value> 
      ...
-     <bitline_address> <bit_value> 
-     <wordline_address> <bit_value> 
+     <bitline_address><wordline_address><bit_value> 
 
   .. note:: When there are multiple configuration regions, each ``<bit_value>`` may consist of multiple bits. For example, ``0110`` represents the bits for 4 configuration regions, where the 4 digits correspond to the bits from region ``0, 1, 2, 3`` respectively.