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diff --git a/Help/envvar/FC.rst b/Help/envvar/FC.rst
index d6cabbc..dcee02d 100644
--- a/Help/envvar/FC.rst
+++ b/Help/envvar/FC.rst
@@ -1,6 +1,8 @@
FC
--
+.. versionadded:: 3.10
+
.. include:: ENV_VAR.txt
Preferred executable for compiling ``Fortran`` language files. Will only be used
@@ -10,3 +12,11 @@ which the value for ``Fortran`` is stored in the cache as
configuration run (including the first), the environment variable will be
ignored if the :variable:`CMAKE_Fortran_COMPILER <CMAKE_<LANG>_COMPILER>`
variable is defined.
+
+.. note::
+ Options that are required to make the compiler work correctly can be included;
+ they can not be changed.
+
+.. code-block:: console
+
+ $ export FC="custom-compiler --arg1 --arg2"