(syms_of_buffer): Doc fix.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/buffer.c b/src/buffer.c
index f996015c459..9e21832bfa0 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1682,6 +1682,10 @@ previously unmodified.  HIGHWORD and LOWWORD are the high and low\n\
 modification count of the most recent save is different, this entry is\n\
 obsolete.\n\
 \n\
+An entry (nil PROP VAL BEG . END) indicates that a text property\n\
+was modified between BEG and END.  PROP is the property name,\n\
+and VAL is the old value.\n\
+\n\
 nil marks undo boundaries.  The undo command treats the changes\n\
 between two undo boundaries as a single step to be undone.\n\
 \n\