diff --git a/doc/rpmbuild.8 b/doc/rpmbuild.8
index 2fd7201ab9..d9aa8c5245 100644
--- a/doc/rpmbuild.8
+++ b/doc/rpmbuild.8
@@ -111,6 +111,13 @@ will be run after a chroot(2) to
.TP
\fB-D, --define='\fIMACRO EXPR\fB'\fR
Defines \fIMACRO\fR with value \fIEXPR\fR.
+.TP
+\fB--scm=\fISCM\fR
+Select the \fISCM\fR to use with %autosetup, if one is not set in the spec file.
+Note that not all values for \fISCM\fR, e.g., \fBpatch\fR (the default) and
+\fBgendiff\fR, \fBgit\fR, or \fBquilt\fR work interchangeably with all
+other patches and options stated in the %autosetup line, especially
+option \fB-p\fIN\fR.
.SS "BUILD OPTIONS"
.PP
The general form of an rpm build command is
diff --git a/rpmpopt.in b/rpmpopt.in
index 6a2077ded5..7021898a42 100644
--- a/rpmpopt.in
+++ b/rpmpopt.in
@@ -210,6 +210,9 @@ rpmbuild alias --with --define "_with_!#:+ --with-!#:+" \
rpmbuild alias --without --define "_without_!#:+ --without-!#:+" \
--POPTdesc=$"disable configure