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diff --git a/api/sets.md b/api/sets.md
index 6dcc9ca9..850d1443 100644
--- a/api/sets.md
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@@ -48,6 +48,15 @@ set := {10, 20, 30}
= [10, 20, 30]
```
+## Length
+
+Set length can be accessed by the `.length` field:
+
+```tomo
+>> {10, 20, 30}.length
+= 3
+```
+
## Iteration
You can iterate over the items in a table like this: