Make it clear that the plugin does nothing without a `sizes` config
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@ -35,11 +35,15 @@ For more advanced templates, see the [**Templates**](#templates) section below.
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### 3. Configure the plugin
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You **must** have a `responsive_image` block in your `_config.yml` for this plugin to work. The minimum required configuration is a `template` path:
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You **must** have a `responsive_image` block in your `_config.yml` for this plugin to work. The minimum required configuration is a `template` path. You should also have a `sizes` configuration or the plugin will not do anything.
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```yaml
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responsive_image:
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template: _includes/responsive-image.html
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sizes:
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- width: 320
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- width: 480
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- width: 800
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```
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For a list of all the available configuration options, see the [**All configuration options**](#all-configuration-options) section below.
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