diff --git a/FONT_TO_PY.md b/FONT_TO_PY.md
index 51682c3..c22a6c5 100644
--- a/FONT_TO_PY.md
+++ b/FONT_TO_PY.md
@@ -45,8 +45,8 @@ installed using `pip3`. On Linux (you may need a root prompt):
 # Usage
 
 `font_to_py.py` is a command line utility written in Python 3. It is run on a
-PC. It takes as input a font file with a `ttf` or `otf` extension and a
-required height in pixels and outputs a Python 3 source file. The pixel layout
+PC. It takes as input a font file with a `ttf`, `otf`, or `bdf` extension and a
+required height in pixels (for bitmap `bdf` fonts, height can be automatically determined) and outputs a Python 3 source file. The pixel layout
 is determined by command arguments. By default fonts are stored in variable
 pitch form. This may be overidden by a command line argument.
 
@@ -69,8 +69,8 @@ $ font_to_py.py -k extended FreeSans.ttf 23 my_extended_font.py
 
 ### Mandatory positional arguments:
 
- 1. Font file path. Must be a ttf or otf file.
- 2. Height in pixels.
+ 1. Font file path. Must be a ttf, otf, or bdf file.
+ 2. Height in pixels. Specify `0` for bdf bitmap files to automatically use native height
  3. Output file path. Filename must have a .py extension (unless writing a
  binary font).
 
diff --git a/README.md b/README.md
index defff6b..900e427 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,8 @@ This comprises three components, links to docs below:
 # font_to_py.py
 
 This command line utility is written in Python 3 and runs on a PC. It takes
-as input a font file in `ttf` or `otf` form together with a height in pixels
+as input a font file in `ttf`, `otf`, or `bdf` form together with a height in pixels 
+(for bitmap fonts in `bdf` format, the height can be automatically detected)
 and outputs a Python source file containing the font as a bitmap. Fixed and
 variable pitch rendering are supported. The design has the following aims: