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diff --git a/docs/reference/groups.yml b/docs/reference/groups.yml
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@@ -83,6 +83,10 @@
automatically decides which is more suitable depending on the base, but you
can also control this manually with the `scripts` and `limits` functions.
+ If you want the base to stretch to fit long top and bottom attachments (for
+ example, an arrow with text above it), use the [`stretch`]($math.stretch)
+ function.
+
# Example
```example
$ sum_(i=0)^n a_i = 2^(1+i) $