-Search backwards for the start of a URL ending at or after
-point. If no URL found, return nil. The access scheme, `http://'
-will be prepended if absent."
+
+Search backwards for the start of a URL ending at or after point. If
+no URL found, return nil. The access scheme will be prepended if
+absent: \"mailto:\" if the string contains \"@\", \"ftp://\" if it
+starts with \"ftp\" and not \"ftp:/\", or \"http://\" by default."
+