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diff --git a/man/systemd.unit.xml b/man/systemd.unit.xml
index 3509388c7d..81634410c1 100644
--- a/man/systemd.unit.xml
+++ b/man/systemd.unit.xml
@@ -102,6 +102,16 @@
<option>false</option> and <option>off</option> are
equivalent.</para>
+ <para>Time span values encoded in unit files can be
+ written in various formats. A stand-alone number
+ specifies a time in seconds. If suffixed with a time
+ unit, the unit is honored. A concatentation of
+ multiple value with units is supported, in which case
+ the values are added up. Example: "50" refers to 50
+ seconds; "2min 200ms" refers to 2 minutes plus 200
+ milliseconds, i.e. 120200ms. The following time units
+ are understood: s, min, h, d, w, ms, us.</para>
+
<para>Empty lines and lines starting with # or ; are
ignored. This may be used for commenting.</para>