Update entries.md to explain the search: parameter a bit more

Link to Pro Search Results as an alternative.

Author: nep

docs/channels/entries.md

@@ -498,7 +498,8 @@ NOTE: **Note:** You will often use this parameter in conjunction with the [if no
 
 The "search:" parameter allows you to constrain Channel Entries output based on content within your fields. You specify which field to search by using the field's short name immediately after "search:". You can search based on whether a field is an exact match to your provided term or whether or not a field simply contains your term.
 
-NOTE: **Note:** Some fields store their content in a manner that affects the ability to work with this parameter. Grid fields, for instance, could only use this parameter for columns with "Include in search?" enabled. Relationship fields cannot be searched using the search parameter.
+NOTE: **Note:** Some fields store their content in a manner that affects the ability to work with this parameter. Grid fields, for instance, can only use this parameter for columns with "Include in search?" enabled (For performance, EE groups those columns into a searchable blob.). You can, however, search on Grid columns by using Pro Search's [`{exp:pro_search:results}`](add-ons/pro-search/tags.md#exppro_searchresults) tag and the [Field Search filter](/add-ons/pro-search/filters.md#field-search). Pro Search can also be used to filter entries by [title](/add-ons/pro-search/filters.md#searchtitle), [url_title](/add-ons/pro-search/filters.md#searchurltitle), [status](/add-ons/pro-search/filters.md#searchstatus), and [more](/add-ons/pro-search/filters.md#field-search). Relationship fields cannot be searched using the "search:" parameter.
+
 
 #### "Exact" Matching