Update README.md

Author: mike-hunhoff

Diff for: README.md

@@ -32,6 +32,8 @@ Use the following steps to install Ghidrathon to your Ghidra environment:
 $ python -m pip install -r requirements.txt
 $ python ghidrathon_configure.py <absolute_path_to_ghidra_install_dir>
 ```
+**Note**: you may be prompted to set an environment variable named `JAVA_HOME`. This should reference that absolute path of the JDK that you have configured for your Ghidra install.
+
 3. Install the Ghidrathon extension (`.zip`) into Ghidra:
    * Using Ghidra's UI:
         * Navigate to `File > Install Extensions...`
@@ -47,7 +49,7 @@ $ python ghidrathon_configure.py <absolute_path_to_ghidra_install_dir>
 
 You can switch Ghidrathon to use a different Python interpreter by running `ghidrathon_configure.py` using the new Python interpreter.
 
-### Python Virtual Environments
+### Using Python Virtual Environments
 
 Ghidrathon supports Python virtual environments. **To use a Python virtual environment, complete step `1` from within your virtual environment.** Do the same when running `ghidrathon_configure.py` to switch the Ghidrathon to use a different interpreter.