diff --git a/README.md b/README.md
index 5e42bf6..2e719aa 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,9 @@
 # dragonglass
 
+This is a utility that turns an Obsidian stack into a directory of HTML pages
+suitable for browsing or serving via a Web server.  Markdown files are transformed
+into HTML; other files are copied verbatim.
+
+The name is derived from the Westerosi name of "obsidian," as seen in George R.R. Martin's
+_A Song of Ice and Fire_ books and the _Game of Thrones_ TV series.
+
diff --git a/src/dragonglass/tree.py b/src/dragonglass/tree.py
index 38519c1..a53cf06 100644
--- a/src/dragonglass/tree.py
+++ b/src/dragonglass/tree.py
@@ -180,6 +180,7 @@ def generate_list(ctxt: Any, source_root: Path) -> list[SourceNode]:
     Generates the list of source nodes from the source path (Obsidian vault).
 
     Args:
+        ctxt (Context): Context for the operation.
         source_root (Path): The root directory (Obsidian vault) to load nodes from.
 
     Returns: