diff --git a/src/parser/plain_link.rs b/src/parser/plain_link.rs
index 6016292..92fd700 100644
--- a/src/parser/plain_link.rs
+++ b/src/parser/plain_link.rs
@@ -63,6 +63,7 @@ pub fn post<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, ()
 
 #[tracing::instrument(ret, level = "debug")]
 pub fn protocol<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
+    // TODO: This should be defined by org-link-parameters
     let (remaining, proto) = alt((
         alt((
             tag_no_case("id"),