More cleanup.

1 files changed, 9 insertions, 0 deletions

diff --git a/exceptions.py b/exceptions.py
index 82a82a5..aa0aecb 100644
--- a/exceptions.py
+++ b/exceptions.py
@@ -1,19 +1,28 @@
 #!/usr/bin/env python3
 
+"""Some exceptions used elsewhere."""
+
 # This module is commonly used by others in here and should avoid
 # taking any unnecessary dependencies back on them.
 
 
 class PreconditionException(AssertionError):
+    """Use to indicate function preconditions violated."""
+
     pass
 
 
 class PostconditionException(AssertionError):
+    """Use to indicate function postconditions violated."""
+
     pass
 
 
 class TimeoutError(Exception):
+    """Use to indicate an operation that timed out."""
+
     def __init__(self, value: str = "Timed out"):
+        super().__init__()
         self.value = value
 
     def __str__(self):