Merge pull request #314 from SpeedyWeather/mk/docs

docs minor stuff

docs/src/grids.md

@@ -90,9 +90,9 @@ and in general ``\frac{m+1}{2}T \approx J`` for _m-th_ order truncation. So the
 order the more grid points are used in combination with the same spectral
 resolution. A higher truncation order therefore makes all grid-point calculations more expensive,
 but can represent products of terms on the grid (which will have higher wavenumber components) to
-a higher accuracy as more grid points are available within a given wavelength.
-
-
+a higher accuracy as more grid points are available within a given wavelength. Using a sufficiently
+high truncation is therefore one way to avoid aliasing. In SpeedyWeather.jl the parameter
+`dealiasing` controls this option, `= 1` would be linear, `= 2` quadratic, `= 3` cubic etc.
 
 ## Full Gaussian grid
 

docs/src/index.md

@@ -7,7 +7,8 @@ precipitation and radiation.
 ## Overview
 
 SpeedyWeather.jl is a global spectral model that uses a spherical harmonic transform to perform some calculations
-in spectral space (time integration, gradients, linear terms) and some in grid-point space (advection, non-linear terms).
+in spectral space (time integration, gradients, linear terms) and some in grid-point space (advection, non-linear terms,
+parameterizations).
 The prognostic variables used are vorticity, divergence, absolute temperature, logarithm of surface
 pressure and specific humidity. The time stepping uses a leapfrog scheme with additional filters and a
 semi-implicit formulation for gravity waves. The default resolution is T31 (96x48 grid points on a