diff --git a/mtheme.dtx b/mtheme.dtx
index ff413a3..8bdf329 100644
--- a/mtheme.dtx
+++ b/mtheme.dtx
@@ -337,6 +337,8 @@ or horizontal |mbarplot| to plot bar charts.
 
 \section{Known Issues}
 
+The |\plain| command does not work if you override the \textsc{metropolis}
+color theme with the default beamer color theme |fly|.
 
 \section{License}