FIX: fix typo

tacaswell · tacaswell · commit 058eea7cbafe · 2016-02-14T16:22:09.000-05:00
diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
@@ -511,7 +511,7 @@ def __init__(self, fig, rect,
         self._init_axis()
         if axisbg is not None and facecolor is not None:
             raise TypeError('Both axisbg and facecolor are not None. '
-                            'These keywords are aliases, only one maybe '
+                            'These keywords are aliases, only one may be '
                             'provided.')
         if axisbg is not None:
             cbook.warn_deprecated(
