Index: head/share/man/man5/src.conf.5
===================================================================
--- head/share/man/man5/src.conf.5
+++ head/share/man/man5/src.conf.5
@@ -1,6 +1,6 @@
 .\" DO NOT EDIT-- this file is @generated by tools/build/options/makeman.
 .\" $FreeBSD$
-.Dd September 8, 2020
+.Dd September 11, 2020
 .Dt SRC.CONF 5
 .Os
 .Sh NAME
@@ -9,7 +9,8 @@
 .Sh DESCRIPTION
 The
 .Nm
-file contains settings that will apply to every build involving the
+file contains variables that control what components will be generated during
+the build process of the
 .Fx
 source tree; see
 .Xr build 7 .
Index: head/share/man/man7/build.7
===================================================================
--- head/share/man/man7/build.7
+++ head/share/man/man7/build.7
@@ -24,12 +24,12 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd August 5, 2020
+.Dd September 11, 2020
 .Dt BUILD 7
 .Os
 .Sh NAME
 .Nm build
-.Nd information on how to build the system
+.Nd General instructions on how to build the system
 .Sh DESCRIPTION
 The sources for the
 .Fx
@@ -66,10 +66,11 @@
 things in that directory.
 Issuing the
 .Xr make 1
-command in any directory or
-subdirectory of those directories has the same effect as issuing the
-same command in all subdirectories of that directory.
-With no target specified, the things in that directory are just built.
+command in any directory issues the
+.Xr make 1
+command recursively in all subdirectories.
+With no target specified, the items in the directories are built
+and no further action is taken.
 .Pp
 A source tree is allowed to be read-only.
 As described in
@@ -93,6 +94,14 @@
 section below, and by the variables documented in
 .Xr make.conf 5 .
 .Pp
+The default components included in the build are specified in the file
+.Pa /etc/src.conf
+in the source tree.
+To override the default file, include the SRCCONF option in the make steps,
+pointing to a custom src.conf file.
+For more information see
+.Xr src.conf 5 .
+.Pp
 The following list provides the names and actions for the targets
 supported by the build system:
 .Bl -tag -width ".Cm cleandepend"
@@ -583,6 +592,12 @@
 .Bd -literal -offset indent
 make PORTS_MODULES=emulators/kqemu-kmod kernel
 .Ed
+.It Va SRCCONF
+Specify a file to override the default
+.Pa /etc/src.conf .
+The src.conf file controls the components to build.
+See
+.Xr src.conf 5
 .It Va STRIPBIN
 Command to use at install time when stripping binaries.
 Be sure to add any additional tools required to run
Index: head/tools/build/options/makeman
===================================================================
--- head/tools/build/options/makeman
+++ head/tools/build/options/makeman
@@ -154,7 +154,8 @@
 .Sh DESCRIPTION
 The
 .Nm
-file contains settings that will apply to every build involving the
+file contains variables that control what components will be generated during
+the build process of the
 .Fx
 source tree; see
 .Xr build 7 .