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Extension fields are only supported from 3.4 

Use the minimum supported version in the example
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Maks3w 2018-04-07 18:04:49 +02:00 committed by GitHub
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_includes/content/compose-extfields-sub.md
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@ -3,7 +3,7 @@ special fields can be of any format as long as they are located at the root of
your Compose file and their name start with the `x-` character sequence. your Compose file and their name start with the `x-` character sequence.
```none ```none
version: '2.1' version: '3.4'
x-custom: x-custom:
items: items:
- a - a
@ -29,7 +29,7 @@ logging:
You may write your Compose file as follows: You may write your Compose file as follows:
```none ```none
version: '2.1' version: '3.4'
x-logging: x-logging:
&default-logging &default-logging
options: options:
@ -50,7 +50,7 @@ It is also possible to partially override values in extension fields using
the [YAML merge type](http://yaml.org/type/merge.html). For example: the [YAML merge type](http://yaml.org/type/merge.html). For example:
```none ```none
version: '2.1' version: '3.4'
x-volumes: x-volumes:
&default-volume &default-volume
driver: foobar-storage driver: foobar-storage