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Note that Map fields cannot be optional #200

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Note that Map fields cannot be optional #200

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2 changes: 1 addition & 1 deletion content/programming-guides/proto3.md
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Expand Up @@ -1193,7 +1193,7 @@ map<string, Project> projects = 3;

### Maps Features {#maps-features}

* Map fields cannot be `repeated`.
* Map fields cannot be `repeated` or `optional`.
* Wire format ordering and map iteration ordering of map values is undefined,
so you cannot rely on your map items being in a particular order.
* When generating text format for a `.proto`, maps are sorted by key. Numeric
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