Update runtime files
diff --git a/runtime/doc/undo.txt b/runtime/doc/undo.txt
index 23a30af..3feac2a 100644
--- a/runtime/doc/undo.txt
+++ b/runtime/doc/undo.txt
@@ -257,7 +257,7 @@
 Undo files are normally saved in the same directory as the file.  This can be
 changed with the 'undodir' option.
 
-When the file is encrypted, the text in the undo file is also crypted.  The
+When the file is encrypted, the text in the undo file is also encrypted.  The
 same key and method is used. |encryption|
 
 Note that text properties are not stored in the undo file.  You can restore