Update tags.md

Author: nep

docs/add-ons/pro-search/tags.md

@@ -184,7 +184,13 @@ Use this parameter to pass through a previously executed encoded search query. N
 
 [TOC=4 hide]
 
-The Results tag supports all parameters from the native channel:entries tag and any parameters made available by the Filters. In addition to those, the following parameters are available. Any parameters set in the tag will override the ones in the given query.
+The Results tag supports:
+* all parameters from the native channel:entries tag, and
+* any parameters made available by the Filters in your query.
+
+In addition to those, the following parameters are available to all results. Any parameters set in the results tag will override the ones in the given query.
+
+NOTE: **Note:** The Keywords filter has a parameter for `collection`. If this is not set, the keywords Filter will search ALL collections. The `channel` parameter is available to any results set, including a keywords search, but for keywords searches, it is most efficient to set the specific collection(s) you want to use, rather than limit by channel. This is not used to output the content from a matching result.
 
     {exp:pro_search:results query="{segment_3}" default:limit="10"}
      {if count ==  1}<ol>{/if}