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diff --git a/docs/manual/adding-packages-python.txt b/docs/manual/adding-packages-python.txt
index b8d5331b1d..8f78f89973 100644
--- a/docs/manual/adding-packages-python.txt
+++ b/docs/manual/adding-packages-python.txt
@@ -144,6 +144,13 @@ therefore only use a few of them, or none.
setuptools packages) and +HOST_PKG_PYTHON_SETUPTOOLS_INSTALL_OPT+
(for host setuptools packages).
+* +HOST_PYTHON_FOO_NEEDS_HOST_PYTHON+, to define the host python
+ interpreter. The usage of this variable is limited to host
+ packages. The two supported value are +python2+ and +python3+. It
+ will ensures the right host python package is available and will
+ invoke it for the build. If some build steps are overloaded, the
+ right python interpreter must be explicitly called in the commands.
+
With the Python infrastructure, all the steps required to build and
install the packages are already defined, and they generally work well
for most Python-based packages. However, when required, it is still
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