diff --git a/lib/matplotlib/lines.py b/lib/matplotlib/lines.py
index 1014c497d9c5..6ae0e16f5e13 100644
--- a/lib/matplotlib/lines.py
+++ b/lib/matplotlib/lines.py
@@ -1293,6 +1293,8 @@ def set_dash_joinstyle(self, s):
         """
         How to join segments of the line if it `~Line2D.is_dashed`.
 
+        The default joinstyle is :rc:`lines.dash_joinstyle`.
+
         Parameters
         ----------
         s : `.JoinStyle` or %(JoinStyle)s
@@ -1307,6 +1309,8 @@ def set_solid_joinstyle(self, s):
         """
         How to join segments if the line is solid (not `~Line2D.is_dashed`).
 
+        The default joinstyle is :rc:`lines.solid_joinstyle`.
+
         Parameters
         ----------
         s : `.JoinStyle` or %(JoinStyle)s
diff --git a/lib/matplotlib/patches.py b/lib/matplotlib/patches.py
index adcf2a1b1a77..3dc875e91004 100644
--- a/lib/matplotlib/patches.py
+++ b/lib/matplotlib/patches.py
@@ -499,6 +499,9 @@ def set_joinstyle(self, s):
         """
         Set the `.JoinStyle`.
 
+        The default joinstyle is 'round' for `.FancyArrowPatch` and 'miter' for
+        all other patches.
+
         Parameters
         ----------
         s : `.JoinStyle` or %(JoinStyle)s