1 files changed, 8 insertions, 0 deletions
diff --git a/ext/tk/lib/tk/textmark.rb b/ext/tk/lib/tk/textmark.rb
index 8b42df2f0c..18d52a5bfc 100644
--- a/ext/tk/lib/tk/textmark.rb
+++ b/ext/tk/lib/tk/textmark.rb
@@ -37,6 +37,14 @@ class TkTextMark<TkObject
     @id
   end
 
+  def exist?
+    if ( tk_split_simplelist(_fromUTF8(tk_call_without_enc(@t.path, 'mark', 'names'))).find{|id| id == @id } )
+      true
+    else
+      false
+    end
+  end
+
   def +(mod)
     @id + ' + ' + mod
   end