diff --git a/Readme.md b/Readme.md
index f584705a1bca66eafebd43a1e35ac6faa48b64ed..0214411d7a9d3c52f945b804597a4d0bb28cd273 100644
--- a/Readme.md
+++ b/Readme.md
@@ -16,7 +16,7 @@ in the field work of *Synthèse géologique* (3rd year) to invert the magnetic
 anomalies associated with dykes near the shore of the *Lac du Salagou* (SE
 France).
 
-The anomaly is modelled using the equation (1) and the philosophy presented in
+The anomaly is modelled using the equation (1, see below) and the philosophy presented in
 Beiki \& Pedersen (2012, doi:
 [10.1111/j.1365-2478.2011.01010.x](https://doi.org/10.1111/j.1365-2478.2011.01010.x)).
 
@@ -26,6 +26,19 @@ The model is designed for a dyke with the following characteristics:
 <img src='img/cartoon.png' width='500' height='500'>
 </p>
 
+The anomaly $F$ expected along a profile $x$ is given by
+$$
+F(x) = C \Biggl\{\cos\alpha \biggl[\tan^{-1}\Bigl(\frac{x + w}{z}\Bigr) -
+\tan^{-1}\Bigl(\frac{x - w}{z}\Bigr)\biggr] + \frac{1}{2} \sin\alpha
+\ln\biggl[\frac{(x + w)^2 + z^2}{(x - b)^2 + z^2}\biggr]\Biggr\},
+$$
+with $C = 2kT\sin\beta$, $\alpha = 2I - \beta - 90^\circ$, $k$ the magnetic
+susceptibility, $I = \tan^{-1}\bigl(\tan i / \cos\gamma\bigr)$, where $T$ and
+$i$ are the intensity and inclination of the magnetic field, respectively, and
+$\gamma$ the azimuth of the profile measured clockwise from magnetic north.
+For the other symbols please refer to the figure above.
+
+
 ## Installation
 
 + Unpack the archive at the desired location.
@@ -37,12 +50,13 @@ The model is designed for a dyke with the following characteristics:
 > It ensures that nothing will interfere with the Python libraries
 > that are part of the OS.
 
+
 ## To run the program
 
 In a terminal run `ml-invert latitude strike filename`.
 
 There are several optional parameters to change, for instance, the bounds of
-the inverted parameters or the plot the best model.
+the inverted parameters or the plot of the best model.
 
 The list of the options can be access with `ml-invert -h` or `ml-invert --help`.