README.md in trackler-2.2.1.106

- old
+ new
@@ -9,14 +9,28 @@
 - 153 is an Armstrong number, because: `153 = 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153`
 - 154 is *not* an Armstrong number, because: `154 != 1^3 + 5^3 + 4^3 = 1 + 125 + 64 = 190`
 
 Write some code to determine whether a number is an Armstrong number.
 
+## Exception messages
+
+Sometimes it is necessary to raise an exception. When you do this, you should include a meaningful error message to
+indicate what the source of the error is. This makes your code more readable and helps significantly with debugging. Not
+every exercise will require you to raise an exception, but for those that do, the tests will only pass if you include
+a message.
+
+To raise a message with an exception, just write it as an argument to the exception type. For example, instead of
+`raise Exception`, you shold write:
+
+```python
+raise Exception("Meaningful message indicating the source of the error")
+```
+
 ## Submitting Exercises
 
-Note that, when trying to submit an exercise, make sure the solution is in the `exercism/python/<exerciseName>` directory.
+Note that, when trying to submit an exercise, make sure the solution is in the `$EXERCISM_WORKSPACE/python/armstrong-numbers` directory.
 
-For example, if you're submitting `bob.py` for the Bob exercise, the submit command would be something like `exercism submit <path_to_exercism_dir>/python/bob/bob.py`.
+You can find your Exercism workspace by running `exercism debug` and looking for the line that starts with `Workspace`.
 
 For more detailed information about running tests, code style and linting,
 please see the [help page](http://exercism.io/languages/python).
 
 ## Source