add comma

diff --git a/doc/textutils.texi b/doc/textutils.texi
index b424302ec074efbb7d227cb5c7a94faa176f473b..2e8eabb9938fc6929d34293c3b9679f417e4b22a 100644 (file)
--- a/doc/textutils.texi
+++ b/doc/textutils.texi
@@ -1562,7 +1562,7 @@ When tailing a file by name, if there have been this many consecutive
 iterations for which the size has remained the same, then
 @code{open}/@code{fstat} the file to determine if that file name is
 still associated with the same device/inode-number pair as before.
-When following a log file that is rotated this is approximately the
+When following a log file that is rotated, this is approximately the
 number of seconds between when tail prints the last pre-rotation lines
 and when it prints the lines that have accumulated in the new log file.
 See the output of @code{tail --help} for the default value.