sd-login: document that result is in microseconds

diff --git a/man/sd_session_is_active.xml b/man/sd_session_is_active.xml
index 716d8e162e24c4d31f18288f47165b1a3cf277b8..a3cc9befe8daea268a5b2d077129b9b5e4fd0b38 100644 (file)
--- a/man/sd_session_is_active.xml
+++ b/man/sd_session_is_active.xml
@@ -187,7 +187,8 @@
 
     <para><function>sd_session_get_start_time()</function> may be used to
     determine the start time of the session identified by the specified
-    session identifier belongs to.</para>
+    session identifier belongs to. The <parameter>usec</parameter>
+    is in microseconds since the epoch (<constant>CLOCK_REALTIME</constant>).</para>
 
     <para><function>sd_session_get_service()</function> may be used to
     determine the name of the service (as passed during PAM session