diff --git a/set/dset.hpp b/set/dset.hpp
index 79b33c00..2c10acab 100644
--- a/set/dset.hpp
+++ b/set/dset.hpp
@@ -68,7 +68,15 @@ namespace cruft::set {
         ///
         /// Items must be in sorted order, and must be a subset of this
         /// container.
-        void erase (std::span<ValueT const>);
+        void erase (std::span<ValueT const> rhs)
+        {
+            *this = *this - rhs;
+        }
+
+        void erase (ValueT const &val)
+        {
+            erase (std::span (&val, 1));
+        }
 
         /// Tests if the list is a subset of this container.
         ///