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diff --git a/apps/man/mupdf.1 b/apps/man/mupdf.1
index 99179d69..9103a034 100644
--- a/apps/man/mupdf.1
+++ b/apps/man/mupdf.1
@@ -81,6 +81,9 @@ Toggle between color and grayscale rendering.
.TP
.B i
Toggle between normal and inverted color rendering.
+.P
+Sending a \fBSIGHUP\fR signal to the mupdf process will also cause the viewed
+file to be reloaded automatically, for use in e.g. build scripts.
.SH SEE ALSO
.BR mupdfclean (1),
.BR mupdfdraw (1),