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diff --git a/stapprobes.5.in b/stapprobes.5.in
index 7a3a3edd..2db9cf1f 100644
--- a/stapprobes.5.in
+++ b/stapprobes.5.in
@@ -69,6 +69,17 @@ reasonable range (1 to around a million), and M is restricted to be
smaller than N. There are no target variables provided in either
context. It is possible for such probes to be run concurrently on
a multi-processor computer.
+.PP
+Alternatively, intervals may be specified in units of milliseconds.
+There are two probe point variants similar to the jiffies timer:
+.SAMPLE
+timer.ms(N)
+timer.ms(N).randomize(M)
+.ESAMPLE
+Here, N and M are specified in milliseconds. The probe intervals will be
+rounded up to the nearest jiffies interval for the actual timer. If the
+"randomize" component is given, then the random value will be added to the
+interval before the conversion to jiffies.
.SS DWARF