Documentation updates

1 files changed, 7 insertions, 3 deletions

diff --git a/examples/environment.py b/examples/environment.py
index fb90838c..a24734f1 100755
--- a/examples/environment.py
+++ b/examples/environment.py
@@ -8,12 +8,16 @@ import cmd2
 
 class EnvironmentApp(cmd2.Cmd):
     """ Example cmd2 application. """
-    degrees_c = 22
-    sunny = False
 
     def __init__(self):
         super().__init__()
-        self.add_settable(cmd2.Settable('degrees_c', int, 'Temperature in Celsius'))
+        self.degrees_c = 22
+        self.sunny = False
+        self.add_settable(cmd2.Settable('degrees_c',
+                                        int,
+                                        'Temperature in Celsius',
+                                        onchange_cb=self._onchange_degrees_c
+                                        ))
         self.add_settable(cmd2.Settable('sunny', bool, 'Is it sunny outside?'))
 
     def do_sunbathe(self, arg):