Add some docstrings.

src/tblib/__init__.py

@@ -49,6 +49,12 @@ def __init__(self, code):
 class Frame:
     """
     Class that replicates just enough of the builtin Frame object to enable serialization and traceback rendering.
+
+    Args:
+
+        get_locals (callable): A function that take a frame argument and returns a dict.
+
+            See :class:`Traceback` class for example.
     """
 
     def __init__(self, frame, *, get_locals=None):
@@ -69,6 +75,21 @@ def clear(self):
 class Traceback:
     """
     Class that wraps builtin Traceback objects.
+
+    Args:
+        get_locals (callable): A function that take a frame argument and returns a dict.
+
+            Ideally you will only return exactly what you need, and only with simple types that can be json serializable.
+
+            Example:
+
+            .. code:: python
+
+                def get_locals(frame):
+                    if frame.f_locals.get("__tracebackhide__"):
+                        return {"__tracebackhide__": True}
+                    else:
+                        return {}
     """
 
     tb_next = None

src/tblib/pickling_support.py

@@ -73,6 +73,11 @@ def _get_subclasses(cls):
 
 
 def install(*exc_classes_or_instances, get_locals=None):
+    """
+    Args:
+
+        get_locals (callable): A function that take a frame argument and returns a dict. See :class:`tblib.Traceback` class for example.
+    """
     copyreg.pickle(TracebackType, partial(pickle_traceback, get_locals=get_locals))
 
     if not exc_classes_or_instances: