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-rw-r--r--semiring/src/lib.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/semiring/src/lib.rs b/semiring/src/lib.rs
index 6c0e0d5..b3e26b7 100644
--- a/semiring/src/lib.rs
+++ b/semiring/src/lib.rs
@@ -33,6 +33,8 @@ pub trait Semiring {
/// The addition.
fn add(&mut self, other: &Self);
+ // FIXME: The multiplication needs another information: the parent
+ // of the other value in the item derivation tree.
/// The multiplication.
fn mul(&mut self, other: &Self);