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-rw-r--r--runtime/doc/undo.txt4
1 files changed, 2 insertions, 2 deletions
diff --git a/runtime/doc/undo.txt b/runtime/doc/undo.txt
index 2c5568ea2..c0b9d1251 100644
--- a/runtime/doc/undo.txt
+++ b/runtime/doc/undo.txt
@@ -267,8 +267,8 @@ Reading an existing undo file may fail for several reasons:
The file text differs from when the undo file was written. This means
the undo file cannot be used, it would corrupt the text. This also
happens when 'encoding' differs from when the undo file was written.
-*E825* *E826* The undo file does not contain valid contents and cannot be
- used.
+*E825* *E826* *E831*
+ The undo file does not contain valid contents and cannot be used.
*E827* The magic number at the end of the file was not found. This usually
means the file was truncated.