closes #184

Author: sofiiako

Variables/Undefined variable/task.md

@@ -4,9 +4,10 @@ Variable names may only contain Latin letters, digits, and/or the underscore
 character, and they cannot start with a digit. They also cannot be any of the 
 reserved <a href="https://docs.python.org/3/reference/lexical_analysis.html#keywords">keywords</a>.
 ### Task
-Check what happens if you use a variable which is not defined yet. Run the code in the editor – try to print out an undefined name.  
+Check what happens if you use a variable which is not defined yet. Change and run the code in the editor – try to print out an undefined name.  
+This should cause an exception - a `NameError`.
 
-Note, that "check" command only runs the testing system, and you will not see the output.
+Note, that "check" command only runs the testing system, and you will not see the output, so you need to run the file.
 
 <div class="hint">Type the name of an undefined variable inside the brackets of the <code>print</code> statement. 
 Note that variable names must start with a letter and can contain only letters, '_', and numbers.</div>