README.md: update

README.md

@@ -19,6 +19,16 @@ This project requires `python>=3.8` to work correctly and the following modules
 * seaborn>=0.10.1
 * matplotlib>=3.1.2
 
+## Build the Sphinx documentation
+
+The documentation was build using `Sphinx`.
+
+To build the documentation (which contains this document and the Api of the program), go in the doc folder and enter: 
+
+```console
+$ make html
+```
+
 ## Usage
 
 ### `gc_content` module
@@ -105,4 +115,4 @@ The figure to give to the `--norm` parameter must be defined like this:
 
 * The column condition must contain the same conditions defined in the `condition` column of the design file. 
 * The column replicate must contain the same replicates names in the `replicate` column of the design file.
-* The column coef contain a value used to normalise the coverage
+* The column coef contain a value used to normalise the coverage
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