diff --git a/README.md b/README.md
index 5ce0338..00b7d99 100644
--- a/README.md
+++ b/README.md
@@ -190,9 +190,9 @@ Included are
 | Barrell & Sears (1939) | `BarrellAndSears()` | Outdated model, especially poor for short wavelengths. |
 | Ciddor (1996) | `Ciddor()` | Only at standard atmosphere. CO2 density can be changed. |
 | Edlen (1953) | `Edlen1953()` | The equation by Edlèn, 1953, combined with modification from Barrel (1951), to include temperature, pressure and humidity dependence. |
-| Edlen (1966) | `Edlen1966()` | Only at standard atmosphere. Function requires wavelength only. |
-| Owens (1967) | `Owens()` | - |
-| Bonsch & Potulski (1998) | `BonschPotulski()` | Function does not include humidity |
+| Edlen (1966) | `Edlen1966()` | Allows for any temperature, pressure, humidity and CO2 density.|
+| Owens (1967) | `Owens()` | Allows for any temperature, pressure, humidity. |
+| Bonsch & Potulski (1998) | `BonschPotulski()` | Allows for any temperature, pressure, humidity and CO2 density. |
 | Birch & Downs (1994) | `BirchDowns()` | Only at standard atmosphere. Function requires wavelength only. |
 | Peck & Reeder (1972) | `PeckReeder()` | Only at standard atmosphere. Function requires wavelength only. |
 | Hohenkerk & Sinclair (1985) | `HohenkerkAndSinclair()` | Based on Barrell & Sears equation. Generally, gives slightly larger values.|
@@ -229,6 +229,6 @@ Presently, several observatories are known. These can all be found in the `obser
 
 ## Other
 
-This package also contains a python native port of the `SLA_REFRO()` routine of the pyslalib package, which was originally written in FORTRAN by P.T. Wallace. It can be called directly using `sla_refro()`. When using the same units as the other refraction functions, you might prefer using `slalib_refraction()` or `slalib_dispersion()`.
+This package also contains a python native port of the `SLA_REFRO()` routine of the pyslalib package, which was originally written in FORTRAN by P.T. Wallace. It can be called directly using `sla_refro()`. When using the same units as the other refraction functions, you might prefer using `slalib_refraction()` or `slalib_dispersion()`. Do note that this implementation is slower than the (compiled) FORTRAN implementation.
 
 Finally, the dispersion model used by Alexei Filippenko in 1982 is also included. This model is a combination of the (modified) Edlèn equation and a plane-parallel atmospheric geometry. This calculation can be accessed by calling the `Filippenko1982()` function.
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