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-rw-r--r--doc/utils.texi6
1 files changed, 4 insertions, 2 deletions
diff --git a/doc/utils.texi b/doc/utils.texi
index e7a9b40b35..44ce285d26 100644
--- a/doc/utils.texi
+++ b/doc/utils.texi
@@ -110,11 +110,13 @@ maximum of 2 digits. The @var{m} at the end expresses decimal value for
@emph{or}
@example
-[-]@var{S}+[.@var{m}...]
+[-]@var{S}+[.@var{m}...][s|ms|us]
@end example
@var{S} expresses the number of seconds, with the optional decimal part
-@var{m}.
+@var{m}. The optional literal suffixes @samp{s}, @samp{ms} or @samp{us}
+indicate to interpret the value as seconds, milliseconds or microseconds,
+respectively.
In both expressions, the optional @samp{-} indicates negative duration.