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-rw-r--r--doc/concepts/expressions.md3
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diff --git a/doc/concepts/expressions.md b/doc/concepts/expressions.md
index 80378191..a14cd60f 100644
--- a/doc/concepts/expressions.md
+++ b/doc/concepts/expressions.md
@@ -256,6 +256,9 @@ those) argument(s) to obtain the final result.
- `"reverse"` The argument has to be a list. The result is a new list
with the entries in reverse order.
+- `"length"` The argument has to be a list. The result is the length
+ of the list.
+
- `"++"` The argument has to be a list of lists. The result is
the concatenation of those lists.