Follow up on #14424 for docstring

ImportanceOfBeingErnest · web-flow · commit 8a8ecd4cbc26 · 2019-08-30T14:45:36.000+02:00
diff --git a/lib/matplotlib/quiver.py b/lib/matplotlib/quiver.py
@@ -73,7 +73,8 @@
     The x and y direction components of the arrow vectors.
 
     They must have the same number of elements, matching the number of arrow
-    locations. They may be masked.
+    locations. *U* and *V* may be masked. Only locations unmasked in
+    *U*, *V*, and *C* will be drawn.
 
 C : 1D or 2D array-like, optional
     Numeric data that defines the arrow colors by colormapping via *norm* and
