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diff --git a/doc/join.md b/doc/join.md
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@@ -16,7 +16,7 @@ Join requires each element of its argument to be an array, and their ranks to ma
∾"abc"‿'d'‿"ef" # Includes an atom
RANK ERROR
- ∾"abc"‿(<'d')‿"ef" # Includes a scalar
+ ∾"abc"‿(<'d')‿"ef" # Includes a unit
RANK ERROR
However, Join has higher-dimensional uses as well. Given a rank-`m` array of rank-`n` arrays (requiring `m≤n`), it will merge arrays along their first `m` axes. For example, if the argument is a matrix of matrices representing a [block matrix](https://en.wikipedia.org/wiki/Block_matrix), Join will give the corresponding unblocked matrix as its result.