diff --git a/pyexcel_xls/__init__.py b/pyexcel_xls/__init__.py
index a0c9118..96e6259 100644
--- a/pyexcel_xls/__init__.py
+++ b/pyexcel_xls/__init__.py
@@ -10,6 +10,9 @@
 from pyexcel_io.io import get_data as read_data, isstream, store_data as write_data
 
 
+__pyexcel_io_plugins__ = ['xls']
+
+
 def get_data(afile, file_type=None, **keywords):
     if isstream(afile) and file_type is None:
         file_type = 'xls'