diff --git a/doc/api/next_api_changes/behavior/23475-WLQ.rst b/doc/api/next_api_changes/behavior/23475-WLQ.rst
new file mode 100644
index 000000000000..9f46e0ade107
--- /dev/null
+++ b/doc/api/next_api_changes/behavior/23475-WLQ.rst
@@ -0,0 +1,5 @@
+The markerfacecoloralt parameter to Line2D is now supported by axes.errorbar
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+- markerfacecoloralt is now passed to the line plotter from axes.errorbar
+- Documentation for axes.errorbar how accurately lists which properties are
+  passed on to Line2D, rather than claiming that all kwargs are passed on
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index e9b3e078b2a0..8b396d7ce745 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -3367,7 +3367,25 @@ def errorbar(self, x, y, yerr=None, xerr=None,
             property names, *markerfacecolor*, *markeredgecolor*, *markersize*
             and *markeredgewidth*.
 
-            Valid kwargs for the marker properties are `.Line2D` properties:
+            Valid kwargs for the marker properties are:
+
+            - *dashes*
+            - *dash_capstyle*
+            - *dash_joinstyle*
+            - *drawstyle*
+            - *fillstyle*
+            - *linestyle*
+            - *marker*
+            - *markeredgecolor*
+            - *markeredgewidth*
+            - *markerfacecolor*
+            - *markerfacecoloralt*
+            - *markersize*
+            - *markevery*
+            - *solid_capstyle*
+            - *solid_joinstyle*
+
+            Refer to the corresponding `.Line2D` property for more details:
 
             %(Line2D:kwdoc)s
         """
@@ -3467,6 +3485,7 @@ def _upcast_err(err):
         # Eject any line-specific information from format string, as it's not
         # needed for bars or caps.
         for key in ['marker', 'markersize', 'markerfacecolor',
+                    'markerfacecoloralt',
                     'markeredgewidth', 'markeredgecolor', 'markevery',
                     'linestyle', 'fillstyle', 'drawstyle', 'dash_capstyle',
                     'dash_joinstyle', 'solid_capstyle', 'solid_joinstyle',