tvalentyn commented on code in PR #30744:
URL: https://github.com/apache/beam/pull/30744#discussion_r1544797693
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website/www/site/content/en/documentation/transforms/python/elementwise/flatmap.md:
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@@ -49,7 +49,15 @@ We define a function `split_words` which splits an input
`str` element using the
{{< playground_snippet language="py" path="SDK_PYTHON_FlatMapFunction"
show="flatmap_function" >}}
{{< /playground >}}
-### Example 3: FlatMap with a lambda function
+### Example 3: FlatMap without a function
+
+If you already have a `PCollection` of iterables, you can use `FlatMap`
without a function.
Review Comment:
```suggestion
A common use case of `FlatMap` is to flatten a `PCollection` of iterables
into a `PCollection` of elements. To do that, don't specify the function
argument to `FlatMap`, which uses the identity mapping function.
```
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