diff --git a/lib/modules/datasource/custom/readme.md b/lib/modules/datasource/custom/readme.md
index 1a6facfa034016..7391076f901b65 100644
--- a/lib/modules/datasource/custom/readme.md
+++ b/lib/modules/datasource/custom/readme.md
@@ -7,11 +7,11 @@ This example shows how to update the `k3s.version` file with a custom datasource
 
 Options:
 
-| option                     | default | description                                                                                                                                                              |
-| -------------------------- | ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
-| defaultRegistryUrlTemplate | ""      | URL used if no `registryUrl` is provided when looking up new releases                                                                                                    |
-| format                     | "json"  | format used by the API. Available values are: `json`, `plain`, `yaml`, `html`                                                                                            |
-| transformTemplates         | []      | [JSONata rules](https://docs.jsonata.org/simple) to transform the API output. Each rule will be evaluated after another and the result will be used as input to the next |
+| option                     | default  | description                                                                                                                                                              |
+| -------------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
+| defaultRegistryUrlTemplate | `""`     | URL used if no `registryUrl` is provided when looking up new releases                                                                                                    |
+| format                     | `"json"` | format used by the API. Available values are: `json`, `plain`, `yaml`, `html`                                                                                            |
+| transformTemplates         | `[]`     | [JSONata rules](https://docs.jsonata.org/simple) to transform the API output. Each rule will be evaluated after another and the result will be used as input to the next |
 
 Available template variables: