[PATCH] Document additional environmental variables

[Pablo Pita]

---
 Documentation/environment_variables.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/environment_variables.rst b/Documentation/environment_variables.rst
index 4e9fbb27..7cc13e9f 100644
--- a/Documentation/environment_variables.rst
+++ b/Documentation/environment_variables.rst
@@ -37,6 +37,11 @@ LIBCAMERA_IPA_MODULE_PATH
 
    Example value: ``${HOME}/.libcamera/lib:/opt/libcamera/vendor/lib``
 
+LIBCAMERA_IPA_PROXY_PATH
+   Define custom full path for a proxy worker for a given executable name.
+   
+   Example value: ``${HOME}/.libcamera/proxy/worker:/opt/libcamera/vendor/proxy/worker``
+   
 LIBCAMERA_PIPELINES_MATCH_LIST
    Define an ordered list of pipeline names to be used to match the media
    devices in the system. The pipeline handler names used to populate the
@@ -50,6 +55,11 @@ LIBCAMERA_RPI_CONFIG_FILE
 
    Example value: ``/usr/local/share/libcamera/pipeline/rpi/vc4/minimal_mem.yaml``
 
+LIBCAMERA_RPI_TUNING_FILE
+   Define a custom JSON tuning file to use in the Raspberry Pi.
+
+   Example value: ``/usr/local/share/libcamera/ipa/rpi/vc4/custom_sensor.json``
+
 Further details
 ---------------
 
-- 
2.43.0