diff --git a/src/distributions/weighted.rs b/src/distributions/weighted.rs
index 1a4451e88e1..0a09c698f9c 100644
--- a/src/distributions/weighted.rs
+++ b/src/distributions/weighted.rs
@@ -410,9 +410,13 @@ pub trait AliasMethodWeight:
     + DivAssign
     + Sum
 {
+    /// Maximum number representable by `Self`.
     const MAX: Self;
+
+    /// Element of `Self` equivalent to 0.
     const ZERO: Self;
 
+    /// Converts an [`usize`] to a `Self`, rounding if necessary.
     fn try_from_usize_lossy(n: usize) -> Option<Self>;
 }