Update README.md

README.md

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 # Unitful.jl
 
-Unitful is a Julia package for physical units. Available
-[here](https://github.com/ajkeller34/Unitful.jl). Inspired by:
-
-- [SIUnits.jl](https://github.com/keno/SIUnits.jl)
-- [EngUnits.jl](https://github.com/dhoegh/EngUnits.jl)
-- [Units.jl](https://github.com/timholy/Units.jl)
-
-We want to support not only SI units but also any other unit system. We also
-want to minimize or in some cases eliminate the run-time penalty of units.
-There should be facilities for dimensional analysis. All of this should
-integrate easily with the usual mathematical operations and collections that
-are found in Julia base.
+Unitful is a Julia package for physical units. We want to support not only
+SI units but also any other unit system. We also want to minimize or in some
+cases eliminate the run-time penalty of units. There should be facilities
+for dimensional analysis. All of this should integrate easily with the usual
+mathematical operations and collections that are found in Julia base.
 
 ## Documentation
 
 [Stable](http://ajkeller34.github.io/Unitful.jl/stable) and
 [latest](https://ajkeller34.github.io/Unitful.jl/latest) versions available.
+
+## Other packages in the Unitful family
+
+- [UnitfulUS.jl](https://github.com/ajkeller34/UnitfulUS.jl): Adds U.S. customary units. Serves as an example for how to implement a units 
+  package.
+- [UnitfulIntegration.jl](https://github.com/ajkeller34/UnitfulIntegration.jl): Enables use of Unitful quantities with [QuadGK.jl](https://github.com/JuliaMath/QuadGK.jl). PRs for other integration packages are welcome.
+
+## Related packages
+
+Unitful was inspired by:
+
+- [SIUnits.jl](https://github.com/keno/SIUnits.jl)
+- [EngUnits.jl](https://github.com/dhoegh/EngUnits.jl)
+- [Units.jl](https://github.com/timholy/Units.jl)