added additional wildcard info

README.md

@@ -377,6 +377,7 @@ by specifying `src`, and one of the `layerName` or `layerIndex` options.
 * `layerName`: string, target layer name in the After Effects project
 * `layerIndex`: integer, can be used instead of `layerName` to select a layer by providing an index, starting from 1 (default behavior of AE jsx scripting env)
 * `composition`: string, composition where the layer is, useful for searching layer in pre-compositions. If none is provided, it uses the default composition set in the template.
+Providing `"*"` will result in a wildcard compostion matching, and will apply this data to every matching layer in every matching composition.
 
 Specified asset from `src` field will be downloaded/copied to the working directory, and just before rendering will happen,
 a fotage item with specified `layerName` or `layerIndex` in the original project will be replaced with the freshly downloaded asset.