diff --git a/blender_asset_tracer/pack/__init__.py b/blender_asset_tracer/pack/__init__.py
index f4fd699..1923996 100644
--- a/blender_asset_tracer/pack/__init__.py
+++ b/blender_asset_tracer/pack/__init__.py
@@ -79,6 +79,20 @@ class Aborted(RuntimeError):
 
 
 class Packer:
+    """Takes a blend file and bundle it with its dependencies.
+
+    The process is separated into two functions:
+
+        - strategise() finds all the dependencies and determines what to do
+          with them.
+        - execute() performs the actual packing operation, by rewriting blend
+          files to ensure the paths to moved files are correct, and
+          transferring the files.
+
+    The file transfer is performed in a separate thread, by a FileTransferer
+    instance.
+    """
+
     def __init__(self,
                  bfile: pathlib.Path,
                  project: pathlib.Path,