less verbal warning

minggli · minggli · commit d4b0f7d68951 · 2018-10-24T13:34:08.000+01:00
diff --git a/pandas/io/parsers.py b/pandas/io/parsers.py
@@ -639,7 +639,8 @@ def parser_f(filepath_or_buffer,
         if delimiter is None:
             delimiter = sep
         else:
-            warnings.warn("delimiter is deprecated, please use sep instead.",
+            # GH 21996
+            warnings.warn("delimiter is deprecated, use sep instead.",
                           FutureWarning, stacklevel=2)
 
         if delim_whitespace and delimiter != default_sep:
