diff --git a/docs/handbook/image-file-formats.rst b/docs/handbook/image-file-formats.rst
index 08af189da82..33e02355041 100644
--- a/docs/handbook/image-file-formats.rst
+++ b/docs/handbook/image-file-formats.rst
@@ -44,8 +44,9 @@ BMP
 ^^^
 
 Pillow reads and writes Windows and OS/2 BMP files containing ``1``, ``L``, ``P``,
-or ``RGB`` data. 16-colour images are read as ``P`` images. Run-length encoding
-is not supported.
+or ``RGB`` data. 16-colour images are read as ``P`` images. 4-bit run-length encoding
+is not supported. Support for reading 8-bit run-length encoding was added in Pillow
+9.1.0.
 
 The :py:meth:`~PIL.Image.open` method sets the following
 :py:attr:`~PIL.Image.Image.info` properties: