diff --git a/tests/parse/test_error.py b/tests/parse/test_error.py
index 96177ec..f6cf264 100644
--- a/tests/parse/test_error.py
+++ b/tests/parse/test_error.py
@@ -1,6 +1,29 @@
 # SPDX-License-Identifier: LGPL-2.1-only
 # Copyright 2022 Jookia <contact@jookia.org>
 
+# Parse error reporting consists of the following data structures:
+#
+# ParseTasks represent a task such as parsing a file or directive.
+#
+# ParseContexts represent a step during the parsing process for the purposes of
+# error reporting.
+# A context contains:
+# - A ParseTask specifying the step
+# - The Token the task started at (possibly None)
+# - A parent ParseContext (possibly None) if this task is a component
+#   of another task
+#
+# ParseErrors represent an error encountered during a parsing task, such as an
+# unexpected token or invalid token.
+#
+# ParseErrorExceptions represent an error encounted during parsing.
+# An error exception contains:
+# - A ParseError detailing the error
+# - The Token the error is at (possibly None)
+# - An expected string (possibly None), used if the parser is expecting
+#   a single, specific token such as a keyword
+# - A ParseContext detailing the current parsing task
+
 from hypothesis.strategies import composite, integers, sampled_from, text
 
 from src.parse import (