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-rw-r--r--docs/source/usage/environmentvars.rst12
1 files changed, 12 insertions, 0 deletions
diff --git a/docs/source/usage/environmentvars.rst b/docs/source/usage/environmentvars.rst
index 0717a9fa..304b9276 100644
--- a/docs/source/usage/environmentvars.rst
+++ b/docs/source/usage/environmentvars.rst
@@ -51,6 +51,18 @@ done by setting the variable with no content::
:envvar:`PROJ_LIB` to allow for multiple versions of PROJ
resource files on your system without conflicting.
+
+.. envvar:: PROJ_AUX_DB
+
+ .. versionadded:: 8.1.0
+
+ To set the path to one or several auxiliary SQLite3 databases of structure
+ identical to the main ``proj.db`` database and that can contain additional
+ object (CRS, transformation, ...) definitions. If several paths are
+ provided, they must be separated by the colon (:) character on Unix, and
+ on Windows, by the semi-colon (;) character.
+
+
.. envvar:: PROJ_DEBUG
Set the debug level of PROJ. The default debug level is zero, which results