Updates porter explain documentation

Signed-off-by: Tomi Paananen <[email protected]>
getporter · May 23, 2023 · 28ae88f · 28ae88f
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diff --git a/docs/content/cli/explain.md b/docs/content/cli/explain.md
@@ -11,6 +11,8 @@ Explain a bundle
 
 Explain how to use a bundle by printing the parameters, credentials, outputs, actions.
 
+The [Custom](../bundle/manifest/_index.md#custom) section data is only shown when the output format is JSON or YAML. Because the data can have an arbitrary structure, there is no coherent way to display it in a table.
+
 ```
 porter explain REFERENCE [flags]
 ```