diff --git a/dipy/workflows/base.py b/dipy/workflows/base.py
index 8c7c1002bb..23f23b00e3 100644
--- a/dipy/workflows/base.py
+++ b/dipy/workflows/base.py
@@ -101,7 +101,7 @@ def add_workflow(self, workflow):
             ref_text = [text if text else "\n" for text in npds['References']]
             ref_idx = self.epilog.find('References: \n') + len('References: \n')
             self.epilog = "{0}{1}\n{2}".format(self.epilog[:ref_idx],
-                                               ''.join([text for text in ref_text]),
+                                               ''.join(ref_text),
                                                self.epilog[ref_idx:])
 
         self.outputs = [param for param in npds['Parameters'] if
@@ -109,11 +109,17 @@ def add_workflow(self, workflow):
 
         args, defaults = get_args_default(workflow.run)
 
+        output_args = self.add_argument_group('output arguments(optional)')
+
         len_args = len(args)
         len_defaults = len(defaults)
 
-        output_args = \
-            self.add_argument_group('output arguments(optional)')
+        if len_args != len(self.doc):
+            raise ValueError(
+                    self.prog + ": Number of parameters in the "
+                    "doc string and run method does not match. "
+                    "Please ensure that the number of parameters "
+                    "in the run method is same as the doc string.")
 
         for i, arg in enumerate(args):
             prefix = ''