diff --git a/README.md b/README.md
index 34bb7eb..5ce0338 100644
--- a/README.md
+++ b/README.md
@@ -60,10 +60,11 @@ The package contains the following files:
 - `/data/1976USSA.txt` 			: Data file of the 1976 US Standard Atmosphere.
 - `ciddorModel.py` 				: Contains the `Observatory()` class to calculate the refractive index of atmospheric air, using the Ciddor (1996) model.
 - `dispersionModels.py` 		: Contains various atmospheric models that can be used to calculate the atmospheric dispersion
-- `misc.py` 				: Contains several miscellaneous functions, e.g. to quickly calculate the refractive index.
-- `refractionModels.py`		 		: Contains various atmospheric models that can be used to calculate the atmospheric refraction
+- `misc.py` 				    : Contains several miscellaneous functions, e.g. to quickly calculate the refractive index.
+- `neoslalib.py`                : Contains a Python native port of the `pyslalib.SLA_REFRO()` routine, translated from the original FORTRAN code.
+- `observatories.py` 			: Contains a dictionary with the average atmospheric conditions for various large observatories around the world.
+- `refractionModels.py`		 	: Contains various atmospheric models that can be used to calculate the atmospheric refraction
 - `refractivityModels.py` 		: Contains various functions from literature to calculate the refractive index. Some examples of works included are Ciddor (1996), Barrell & Sears (1939), SLALIB, Owens (1967) and Edlen (1966).
-- `observatories` 				: Contains a dictionary with the average atmospheric conditions for various large observatories around the world.