add wildcard characters

Author: Fienne

src/faq.md

@@ -448,7 +448,7 @@ those Docker format containers using the Singularity engine. Directly
 specifying a Singularity format container is not part of the CWL standards.
 
 ## How outputBinding.glob works
-The `outputBinding` section describes how to set the value of each output parameter.  The `glob` field is used to return all file paths that match a specific pattern. The value of the glob field is the `output directory ` Wildcard characters can be used in the filenames when searching for files.
+The `outputBinding` section describes how to set the value of each output parameter.  The `glob` field is used to return all file paths that match a specific pattern. The value of the glob field is the `output directory` Wildcard characters can be used in the filenames when searching for files. The wildcard characters can either be an asterisk `*` or a question mark `?`.
 
 ## Debug JavaScript Expressions