---
 CONTRIBUTING.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 78be5ca6..f2e5da21 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -181,6 +181,9 @@ original FreeBSD code.
   `python ./userspace-header-gen.py 
build/arm-rtems4.12-xilinx_zynq_a9_qemu/freebsd/sbin/pfctl/*.o -p pfctl`
   Replace the name (given via -p option) by the name of the userspace tool. It
   has to match the name that is used in the RTEMS linker set further below.
+  `Note:` the script `userspace-header-gen.py` depends on pyelftools. It can be
+  installed using pip:
+  `pip install --user pyelftools`
 * If you regenerated files that have already been generated, you may have to
   remove RTEMS-specific names from the namespace. The defaults (linker set 
names
   and rtems_bsd_program_.*) should already be filtered.
-- 
2.20.1

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