diff --git a/config/locales/en.yml b/config/locales/en.yml
index 8c48283..3107b52 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -72,4 +72,6 @@ en:
   
   label_all_relations:                                "All related to"
 
+  label_descendant_of:                                "Descendant of"
+
   field_root:                                         "Root"
diff --git a/lib/redmine_more_filters/patches/issue_query_patch.rb b/lib/redmine_more_filters/patches/issue_query_patch.rb
index 7b261b2..5d631a9 100644
--- a/lib/redmine_more_filters/patches/issue_query_patch.rb
+++ b/lib/redmine_more_filters/patches/issue_query_patch.rb
@@ -72,6 +72,12 @@ def initialize_available_filters_with_more_filters
             :type  => :integer, 
             :label => :label_all_relations
             
+
+          add_available_filter("descendant_of",
+            :type => :integer,
+            :label => :label_descendant_of
+          )
+
           add_available_filter("created_on_by_clock_time",
             :type => :time_past
           )
@@ -210,6 +216,11 @@ def sql_for_all_relations_field(field, operator, value, options={})
           end
           "(#{sql})"
         end
+
+        def sql_for_descendant_of_field(field, operator, value)
+          sql = "#{Issue.table_name}.id IN ( SELECT DISTINCT i.id FROM #{Issue.table_name} i INNER JOIN #{Issue.table_name} j ON i.root_id = j.root_id AND i.lft > j.lft AND i.rgt < j.rgt WHERE #{sql_for_field("id", "=", value, "j", "id")} )"
+          "(#{sql})"
+        end
         
       end #module
     end #module
diff --git a/lib/redmine_more_filters/patches/queries_helper_patch.rb b/lib/redmine_more_filters/patches/queries_helper_patch.rb
index fe2248a..8536a58 100644
--- a/lib/redmine_more_filters/patches/queries_helper_patch.rb
+++ b/lib/redmine_more_filters/patches/queries_helper_patch.rb
@@ -64,7 +64,7 @@ def filters_options_for_select_with_more_filters(query)
               group = :label_relations
             elsif field_options[:type] == :tree
               group = query.is_a?(IssueQuery) ? :label_relations : nil
-            elsif field =~ /root_id|all_relations/ 
+            elsif field =~ /root_id|all_relations|descendant_of/ 
               group = :label_relations
             elsif field =~ /^cf_\d+\./
               group = (field_options[:through] || field_options[:field]).try(:name)