be more explicit about tuple in docstr

sappelhoff · jklymak · web-flow · commit 56d8aa236d51 · 2021-06-22T18:29:02.000+02:00
Co-authored-by: Jody Klymak &lt;jklymak@gmail.com&gt;
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -4648,7 +4648,7 @@ def hexbin(self, x, y, C=None, gridsize=100, bins=None,
             left of the y-axis.
 
         extent : 4-tuple of float, default: *None*
-            The limits of the bins. The default assigns the limits
+            The limits of the bins (xmin, xmax, ymin, ymax) . The default assigns the limits
             based on *gridsize*, *x*, *y*, *xscale* and *yscale*.
 
             If *xscale* or *yscale* is set to 'log', the limits are
