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diff --git a/doc/concepts/expressions.md b/doc/concepts/expressions.md
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--- a/doc/concepts/expressions.md
+++ b/doc/concepts/expressions.md
@@ -259,6 +259,14 @@ those) argument(s) to obtain the final result.
- `"++"` The argument has to be a list of lists. The result is
the concatenation of those lists.
+ - `"+"` The argument has to be a list of numbers. The result is
+ their sum (where the sum of the empty list is, of course, the
+ neutral element 0).
+
+ - `"*"` The argument has to be a list of numbers. The result
+ is their product (where the producut of the empty list is, of
+ course, the neutral element 1).
+
- `"map_union"` The argument has to be a list of maps. The
result is a map containing as keys the union of the keys of
the maps in that list. For each key, the value is the value