Update julia documentation
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docs/source/howto/languages.rst
docs/source/howto/languages.rst
@@ -74,6 +74,9 @@ Julia
To build an environment with Julia, include a configuration file called
``Project.toml``. The format of this file is documented at
`the Julia Pkg.jl documentation <https://julialang.github.io/Pkg.jl/stable/>`_.
+To specify a specific version of Julia to install, put a Julia version in the
+``Compat`` section of the ``Project.toml`` file, as described
+here: https://julialang.github.io/Pkg.jl/stable/compatibility.
Languages not covered here
==========================

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