diff --git a/src/parser/document.rs b/src/parser/document.rs
index b2e3541..f0972ec 100644
--- a/src/parser/document.rs
+++ b/src/parser/document.rs
@@ -168,6 +168,7 @@ fn section<'r, 's>(context: Context<'r, 's>, mut input: &'s str) -> Res<&'s str,
         }));
     let element_matcher = parser_with_context!(element)(&parser_context);
     let exit_matcher = parser_with_context!(exit_matcher_parser)(&parser_context);
+    // TODO: Match whatever a planning is.
     let (mut remaining, property_drawer_element) =
         opt(parser_with_context!(property_drawer)(&parser_context))(input)?;
     if property_drawer_element.is_none() {