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-rw-r--r--doc/man/pattern_sim.15
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/man/pattern_sim.1 b/doc/man/pattern_sim.1
index e34bf11d..2ce1f9f0 100644
--- a/doc/man/pattern_sim.1
+++ b/doc/man/pattern_sim.1
@@ -132,6 +132,11 @@ Include \fIn\fR samples from the spectrum in the calculation.
.PD
Use \fItype\fR of spectrum. \fItype\fR can be one of \fBtophat\fR or \fBsase\fR.
+.PD 0
+.IP \fB--background=\fR\fIn\fR
+.PD
+Add \fIn\fR photons of Poisson-distributed background uniformly over the detector surface.
+
.SH REFLECTION LISTS