Update README.md

README.md

@@ -43,14 +43,36 @@ A way to install ROCK on your system without sudo rights is to provide the confi
 ./configure --prefix=my_home/my_tools
 ```
 
+Once You have ran ./configure with the options that suit you best, you can check that ROCK works well on your system by running:
+
 ```bash
-./configure
 make check
+```
+
+Make check will compile the code and generate an executable in a temporary location. Then, it will run all unit tests and non regression tests.
+This is not a mandatory step. It eveything goes well, you can go on. Otherwise, you can report the problem to the authors.
+
+To generate the executable, simply run:
+
+```bash
 make
+```
+
+and to install it, run either
+
+```bash
+sudo make install
+```
+
+or
+
+```bash
 make install
 ```
 
-This will create the executable _rock_ that can be run with the following command line model:
+depending on whether you used --prefix or not with ./configure.
+
+The executable _rock_  can be run with the following command line model:
 
 ```bash
 ./rock [options]