Update README.md

README.md

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-Ocean components for the [PALEOtoolkit](https://github.com/PALEOtoolkit) biogeochemical model framework.
-
-The PALEOocean package provides:
+The PALEOocean Julia package provides:
 - a catalog of ocean circulation models, including low-dimensional box models and GCM transport-matrix representations of the global ocean at resolutions up to 1 deg.
 - air-sea exchange
 - vertical tracer and light transport
 - biological production
 - parameterisations of burial fluxes
 
+It can be used to create standalone ocean models, or combined with other components in the [PALEOtoolkit](https://github.com/PALEOtoolkit) biogeochemical model framework to create coupled Earth and exo-Earth system models.
+
 ## Documentation
 
 Documentation is available online at https://paleotoolkit.github.io/PALEOocean.jl/