diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index c233df2..657fe77 100644
--- a/crates/hir/src/lib.rs
+++ b/crates/hir/src/lib.rs
@@ -62,6 +62,8 @@ pub struct IR {
     pub span: Range<usize>
 }
 
+// S-Expression displaying for IR
+// Used for debugging (run `compile` with `-a`)
 impl std::fmt::Display for IRKind {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         match self {
diff --git a/example/iter.hz b/example/iter.hz
index 8ddba9b..32cc159 100644
--- a/example/iter.hz
+++ b/example/iter.hz
@@ -3,8 +3,11 @@ fun iter_ (vec: vec_int) (current: int): void = do
         do end;
     else
         do
+            -- iter logic
+            -- TODO: function as argument
             @get(vec, current) |> @write(_);
             @write("\n");
+
             iter_(vec, current + 1);
         end;
     end;