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-rw-r--r--src/buffer.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/buffer.c b/src/buffer.c
index 94104ef535c..81768849a4b 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -6095,6 +6095,11 @@ and is the visited file's modification time, as of that time. If the
modification time of the most recent save is different, this entry is
obsolete.
+An entry (t . 0) means means the buffer was previously unmodified but
+its time stamp was unknown because it was not associated with a file.
+An entry (t . -1) is similar, except that it means the buffer's visited
+file did not exist.
+
An entry (nil PROPERTY VALUE BEG . END) indicates that a text property
was modified between BEG and END. PROPERTY is the property name,
and VALUE is the old value.