diff --git a/src/combinations.rs b/src/combinations.rs
index 423ffa85..9e7492e9 100644
--- a/src/combinations.rs
+++ b/src/combinations.rs
@@ -209,6 +209,7 @@ where
 {
 }
 
+/// Return the length of the inner iterator and the count of remaining combinations.
 pub(crate) fn n_and_count<I: Iterator>(
     pool: LazyBuffer<I>,
     first: bool,