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-rw-r--r--doc/concepts/expressions.md4
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diff --git a/doc/concepts/expressions.md b/doc/concepts/expressions.md
index b6aa0945..c66de8bc 100644
--- a/doc/concepts/expressions.md
+++ b/doc/concepts/expressions.md
@@ -249,6 +249,10 @@ those) argument(s) to obtain the final result.
same iteration order as the list for all lists indexable by
32-bit integers.
+- `"set"` The argument has to be a list of strings. The result is
+ a map with the members of the list as keys, and all values being
+ `true`.
+
- `"++"` The argument has to be a list of lists. The result is
the concatenation of those lists.