CONTRIBUTING: Explain how to execute code after changes

CONTRIBUTING.rst

@@ -220,6 +220,21 @@ environments and interpreters (Windows, Linux, OS X, Python, Jython,
 IronPython, Python 3, etc). Pull requests are also automatically tested on
 continuous integration.
 
+Executing changed code
+''''''''''''''''''''''
+
+If you want to manually verify the changes, an easy approach is directly
+running the `<src/robot/run.py>`_ script that is part of Robot Framework
+itself. Alternatively you can use the `<rundevel.py>`_ script that sets
+some command line options and environment variables to ease executing tests
+under the `<atest/testdata>`_ directory. It also automatically creates a
+``tmp`` directory in the project root and writes all outputs there.
+
+If you want to install the current code locally, you can do it like
+``python setup.py install`` as explained in `<INSTALL.rst>`_. For
+instructions how to create a distribution that allows installing elsewhere
+see `<BUILD.rst>`_.
+
 Acceptance tests
 ''''''''''''''''
 

rundevel.py

@@ -1,15 +1,20 @@
 #!/usr/bin/env python
 
-"""rundevel.py -- script to run current code
+"""rundevel.py -- script to run the current Robot Framework code
 
 Usage: [interpreter] rundevel.py [run|rebot] [options] [arguments]
 
+Options and arguments are same as Robot Framework itself accepts. Sets some
+command line options and environment variables to ease executing tests under
+the `atest/testdata` directory. Writes all outputs into `tmp` directory in
+the project root.
+
 Examples:
-    ./rundevel.py --name Example tests.txt          # run with python
-    ./rundevel.py run --name Example tests.txt      # same as above
-    jython rundevel.py --name Example tests.txt     # run with jython
-    ./rundevel.py rebot --name Example out.xml      # rebot with python
-    ipy rundevel.py rebot --name Example out.xml    # rebot with ipy
+    ./rundevel.py --name Example tests.robot          # Run with default Python
+    ./rundevel.py run --name Example tests.robot      # Same as the above
+    jython rundevel.py --name Example tests.robot     # Run with Jython
+    ./rundevel.py rebot --name Example out.robot      # Rebot with Jython
+    ipy rundevel.py rebot --name Example out.robot    # Rebot with IronPython
 """
 
 from os.path import abspath, dirname, exists, join