diff --git a/docs/library/framebuf.rst b/docs/library/framebuf.rst
index 657ad461be72e5c421b14d44c9aed57481b544e8..91fc362fddb230cdd317133a5b2ca16566b9f931 100644
--- a/docs/library/framebuf.rst
+++ b/docs/library/framebuf.rst
@@ -39,7 +39,7 @@ Constructors
         - `height` is the height of the FrameBuffer in pixels
         - `format` specifies the type of pixel used in the FrameBuffer;
           valid values are ``framebuf.MVLSB``, ``framebuf.RGB565``
-          and ``framebuf.GS4_HMSB``. MVLSB is monochrome 8-bit color,
+          and ``framebuf.GS4_HMSB``. MVLSB is monochrome 1-bit color,
           RGB565 is RGB 16-bit color, and GS4_HMSB is grayscale 4-bit color.
           Where a color value c is passed to a method, c is a small integer
           with an encoding that is dependent on the format of the FrameBuffer.