1 files changed, 21 insertions, 0 deletions
diff --git a/src/session.py b/src/session.py
index 33870aa..f30160f 100644
--- a/src/session.py
+++ b/src/session.py
@@ -6,17 +6,38 @@ from parser import parseFiles
 from state_json import load, save
 
 class Session:
+    """
+    Represents a play session. During a session, multiple practice and test runs
+    can be made with the same scheduler.
+    """
     def __init__(self, scheduler_name: str, card_files: list[str], state_file: str):
         self._cards = parseFiles(card_files)
         self._state_file = state_file
         self._scheduler = getSchedulerClass(scheduler_name)(self._cards, load(state_file))
 
     def practice(self, size: int) -> Iterator[Card]:
+        """
+        Yields cards for a practice run of the requested size.
+
+        Practice runs do not affect the scheduler state.
+        """
         ids = self._scheduler.practice(size)
         for id in ids:
             yield self._cards[id]
 
     def test(self, size: int) -> Iterator[tuple[Card, Callable]]:
+        """
+        Yields cards for a test run of the requested size.
+
+        A function is yielded with each card that takes single boolean argument.
+        The UI is expected to call the function for each card to indicate whether
+        the user correctly guessed the card (True) or not (False).
+
+        Multiple subsequent calls to the same function overwrite past results.
+
+        When the test run is done, the scheduler state is updated with the
+        collected results
+        """
         ids = self._scheduler.practice(size)
         results = {}