Merge pull request #1 from askprash/main

Update README.md

README.md

@@ -3,5 +3,7 @@
 [![](https://img.shields.io/badge/docs-latest-blue.svg)](https://mit-lae.github.io/IdealGases.jl/dev/) ![Codecov](https://img.shields.io/codecov/c/github/MIT-LAE/IdealGases.jl) [![CI](https://github.com/MIT-LAE/IdealGases.jl/actions/workflows/CI.yml/badge.svg)](https://github.com/MIT-LAE/IdealGases.jl/actions/workflows/CI.yml)
 
 
-A simple package to efficiently calculate ideal gas properties based on NASA polynomials.
+A simple package to efficiently calculate ideal gas properties based on NASA polynomials. This assumes that the specifc heat
+of the gas/mixture is only a function of its temperature, i.e., $c_p(T)$ , $h(T)$, and $s(T,p)$ (note the entropy is a function of both pressure and temperature).
+
 This package also introduces a method for fast calculations of thermodynamic properties of mixtures with fixed composition by calculating an equivalent polynomial representation of the mixture.