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-rw-r--r--Docs/source/running_cpp/parameters.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/Docs/source/running_cpp/parameters.rst b/Docs/source/running_cpp/parameters.rst
index 24296d22d..ea5962321 100644
--- a/Docs/source/running_cpp/parameters.rst
+++ b/Docs/source/running_cpp/parameters.rst
@@ -577,6 +577,12 @@ Laser initialization
``mirror_z_width < dz/cell_size``, the upper bound of the mirror is increased
so that it contains at least ``mirror_z_npoints``.
+* ``warpx.E_external_grid`` & ``warpx.B_external_grid`` (list of `int`) optional (default `0 0 0`)
+ External uniform and constant electrostatic and magnetostatic field added
+ to the grid at initialization. Use with caution as these fields are used for
+ the field solver. In particular, do not use any other boundary condition
+ as periodic.
+
Numerics and algorithms
-----------------------