diff --git a/mrbgems/mruby-set/mrblib/set.rb b/mrbgems/mruby-set/mrblib/set.rb
index 65a315f01..91f2f852e 100644
--- a/mrbgems/mruby-set/mrblib/set.rb
+++ b/mrbgems/mruby-set/mrblib/set.rb
@@ -137,18 +137,6 @@ class Set
     end
   end
 
-  # flatten and flatten! are now implemented in C
-  # See mrbgems/mruby-set/src/set.c
-
-  # superset? and proper_superset? are now implemented in C
-  # See mrbgems/mruby-set/src/set.c
-
-  # subset? and proper_subset? are now implemented in C
-  # See mrbgems/mruby-set/src/set.c
-
-  # intersect? and disjoint? are now implemented in C
-  # See mrbgems/mruby-set/src/set.c
-
   # Iterates over each element in the set.
   #
   # @yield [Object] Each element in the set