Installation.md

@@ -48,6 +48,11 @@ Run the install script in the cloned repository
 > cd shakemap
 > bash install.sh
 ```
+
+If you want to run the tests later, you will need to run install.sh with the -d option:
+```
+> bash install.sh -d
+```
 If no version of `conda` is detected, it will install [miniconda](https://conda.io/miniconda.html), which we use for managing dependencies and creating a virtual environment for running ShakeMap. 
 
 If the script finishes without errors, then the final two lines of output will be