diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index cae009f..cbf0994 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1724,7 +1724,9 @@
 	2		Concealed text is completely hidden unless it has a
 			custom replacement character defined (see
 			|:syn-cchar|.
-	3		Concealed text is completely hidden.
+	3		Concealed text is completely hidden.  Note: when
+			moving the cursor after concealed items the position
+			will be wrong.
 
 
 				*'confirm'* *'cf'* *'noconfirm'* *'nocf'*