diff --git a/NEWS.adoc b/NEWS.adoc
index e25bcbb8c8..cf6e2feee8 100644
--- a/NEWS.adoc
+++ b/NEWS.adoc
@@ -72,6 +72,10 @@ https://github.com/networkupstools/nut/milestone/9
      (which is something NUT code tried to do since the beginning of time),
      and could lead to "segmentation fault" crashes on some platforms.
      [issue #2948, PR #2963]
+   * Documentation build recipes overly zealously pre-processed source files,
+     which was not applicable for each and every document type we have (e.g.
+     binary images for illustrations); this caused grief with some toolkits.
+     [issue #2989]
 
  - common code:
    * Revised common `writepid()` to use `altpidpath()` as location for the
diff --git a/clients/upsmon.c b/clients/upsmon.c
index 9c45dffba8..791617d8fe 100644
--- a/clients/upsmon.c
+++ b/clients/upsmon.c
@@ -3824,7 +3824,10 @@ int main(int argc, char *argv[])
 		exit(check_pdflag());
 
 	if (shutdowncmd == NULL)
-		printf("Warning: no shutdown command defined!\n");
+		printf("Warning: no shutdown command defined%s\n",
+			(minsupplies < 1)
+			? ", but that is OK for a monitoring-only client."
+			: "!");
 
 	/* we may need to get rid of a flag from a previous shutdown */
 	if (powerdownflag != NULL)
diff --git a/conf/upsmon.conf.sample.in b/conf/upsmon.conf.sample.in
index 04cd464ead..8a8383e876 100644
--- a/conf/upsmon.conf.sample.in
+++ b/conf/upsmon.conf.sample.in
@@ -9,6 +9,9 @@
 # MINSUPPLIES (may be 0 if this system is only monitoring other NUT servers),
 # and a POWERDOWNFLAG if this machine is a "primary" system connected to
 # the UPS and drives its late-shutdown power-off command in an emergency.
+# You should also define a SHUTDOWNCMD (like the example below, or something
+# special for your deployment) if MINSUPPLIES is at least 1 and you MONITOR
+# an UPS. A NOTIFYCMD integrating with `upssched` is a common situation too.
 
 # --------------------------------------------------------------------------
 # RUN_AS_USER <userid>
@@ -158,9 +161,11 @@ MINSUPPLIES 1
 # such as posting a message with 'logger' or 'wall' or 'mailx'. Do be careful
 # to plug the UPS back into the wall in a timely fashion.
 #
-# For Windows setup use something like:
+# For Windows setup you should escape backslashes (or use forward slashes in
+# recent OS releases). To shut down, use something like:
 # SHUTDOWNCMD "C:\\WINDOWS\\system32\\shutdown.exe -s -t 0"
-# If you have command line using space character you have to add double quote to them, like this:
+# If you have a command line using space characters, you have to add double
+# quote to them, like this:
 # SHUTDOWNCMD "\"C:\\Program Files\\some command.bat\" -first_arg -second_arg"
 # Or use the old DOS 8.3 file name, like this:
 # SHUTDOWNCMD "C:\\PROGRA~1\\SOMECO~1.bat -first_arg -second_arg"
diff --git a/docs/Makefile.am b/docs/Makefile.am
index 0afa01aa5d..66f68e758d 100644
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -913,7 +913,7 @@ $(SPELLCHECK_BUILDDIR)/$(SPELLCHECK_SRC_ONE)-spellchecked: $(SPELLCHECK_SRCDIR)/
 SPELLCHECK_AUTO_ONE = ( \
 	SPELLCHECK_SRC_ONE="`basename '$?'`" ; \
 	rm -f "$@".failed ; \
-	$(MAKE) $(AM_MAKEFLAGS) -k -s -f "$(abs_top_builddir)/docs/Makefile" SPELLCHECK_SRC="" SPELLCHECK_SRC_ONE="$${SPELLCHECK_SRC_ONE}" SPELLCHECK_BUILDDIR="$(SPELLCHECK_BUILDDIR)" SPELLCHECK_SRCDIR="$(SPELLCHECK_SRCDIR)" "$(SPELLCHECK_BUILDDIR)/$${SPELLCHECK_SRC_ONE}-spellchecked" \
+	$(MAKE) $(AM_MAKEFLAGS) -k -s -f "$(abs_top_builddir)/docs/Makefile" SPELLCHECK_SRC="" SPELLCHECK_SRC_ONE="$${SPELLCHECK_SRC_ONE}" SPELLCHECK_BUILDDIR="$(SPELLCHECK_BUILDDIR)" SPELLCHECK_SRCDIR="$(SPELLCHECK_SRCDIR)" VPATH="$(SPELLCHECK_SRCDIR):$(SPELLCHECK_BUILDDIR):$(VPATH)" "$(SPELLCHECK_BUILDDIR)/$${SPELLCHECK_SRC_ONE}-spellchecked" \
 	|| { RES=$$? ; touch "$@".failed; exit $$RES; } \
 )
 
@@ -947,7 +947,7 @@ spellcheck:
 			if test "$(SPELLCHECK_ENV_DEBUG)" != no ; then \
 				echo "ASPELL MAKEFILE DEBUG: Will see from `pwd` if '$(SPELLCHECK_SRCDIR)/$${docsrc}-spellchecked' is up to date" >&2; \
 			else true ; fi ; \
-			$(MAKE) $(AM_MAKEFLAGS) -s -f "$(abs_top_builddir)/docs/Makefile" SPELLCHECK_SRC="" SPELLCHECK_SRC_ONE="$${docsrc}" SPELLCHECK_BUILDDIR="$(SPELLCHECK_BUILDDIR)" SPELLCHECK_SRCDIR="$(SPELLCHECK_SRCDIR)" "$(SPELLCHECK_BUILDDIR)/$${docsrc}-spellchecked" \
+			$(MAKE) $(AM_MAKEFLAGS) -s -f "$(abs_top_builddir)/docs/Makefile" SPELLCHECK_SRC="" SPELLCHECK_SRC_ONE="$${docsrc}" SPELLCHECK_BUILDDIR="$(SPELLCHECK_BUILDDIR)" SPELLCHECK_SRCDIR="$(SPELLCHECK_SRCDIR)" VPATH="$(SPELLCHECK_SRCDIR):$(SPELLCHECK_BUILDDIR):$(VPATH)" "$(SPELLCHECK_BUILDDIR)/$${docsrc}-spellchecked" \
 			|| FAILED="$$FAILED $(SPELLCHECK_SRCDIR)/$$docsrc"; \
 		done ; \
 	 else \
@@ -957,12 +957,12 @@ spellcheck:
 			echo "ASPELL MAKEFILE DEBUG: from `pwd`: SPELLCHECK_NOEXT_DOCS='$${SPELLCHECK_NOEXT_DOCS}' SPELLCHECK_AUTO_TGT='$${SPELLCHECK_AUTO_TGT}'" ; \
 		else true ; fi ; \
 		if [ x"$${SPELLCHECK_AUTO_TGT}" != x ] ; then \
-			$(MAKE) $(AM_MAKEFLAGS) -k -s -f "$(abs_top_builddir)/docs/Makefile" SPELLCHECK_SRC="" SPELLCHECK_BUILDDIR="$(SPELLCHECK_BUILDDIR)" SPELLCHECK_SRCDIR="$(SPELLCHECK_SRCDIR)" $${SPELLCHECK_AUTO_TGT} ; \
+			$(MAKE) $(AM_MAKEFLAGS) -k -s -f "$(abs_top_builddir)/docs/Makefile" SPELLCHECK_SRC="" SPELLCHECK_BUILDDIR="$(SPELLCHECK_BUILDDIR)" SPELLCHECK_SRCDIR="$(SPELLCHECK_SRCDIR)" VPATH="$(SPELLCHECK_SRCDIR):$(SPELLCHECK_BUILDDIR):$(VPATH)" $${SPELLCHECK_AUTO_TGT} ; \
 			FAILED="`for docsrc in $(SPELLCHECK_SRC); do if [ -e "$(SPELLCHECK_BUILDDIR)/$${docsrc}-spellchecked-auto.failed" ] ; then printf '%s ' "$(SPELLCHECK_SRCDIR)/$${docsrc}" ; rm -f "$(SPELLCHECK_BUILDDIR)/$${docsrc}-spellchecked-auto.failed" ; fi ; done`" ; \
 		fi ; \
 		if [ x"$${SPELLCHECK_NOEXT_DOCS}" != x ] ; then \
 			for docsrc in $${SPELLCHECK_NOEXT_DOCS} ; do \
-				$(MAKE) $(AM_MAKEFLAGS) -k -s -f "$(abs_top_builddir)/docs/Makefile" SPELLCHECK_SRC="" SPELLCHECK_SRC_ONE="$${docsrc}" SPELLCHECK_BUILDDIR="$(SPELLCHECK_BUILDDIR)" SPELLCHECK_SRCDIR="$(SPELLCHECK_SRCDIR)" "$(SPELLCHECK_BUILDDIR)/$${docsrc}-spellchecked" \
+				$(MAKE) $(AM_MAKEFLAGS) -k -s -f "$(abs_top_builddir)/docs/Makefile" SPELLCHECK_SRC="" SPELLCHECK_SRC_ONE="$${docsrc}" SPELLCHECK_BUILDDIR="$(SPELLCHECK_BUILDDIR)" SPELLCHECK_SRCDIR="$(SPELLCHECK_SRCDIR)" VPATH="$(SPELLCHECK_SRCDIR):$(SPELLCHECK_BUILDDIR):$(VPATH)" "$(SPELLCHECK_BUILDDIR)/$${docsrc}-spellchecked" \
 				|| FAILED="$$FAILED $(SPELLCHECK_SRCDIR)/$$docsrc"; \
 			done ; \
 		fi ; \
@@ -1027,7 +1027,7 @@ spellcheck-interactive:
 		if test "$(SPELLCHECK_ENV_DEBUG)" != no ; then \
 			echo "ASPELL (INTERACTIVE) MAKEFILE DEBUG: Will see from `pwd` if '$(SPELLCHECK_SRCDIR)/$${docsrc}-spellchecked' is up to date" >&2; \
 		else true ; fi ; \
-		$(MAKE) $(AM_MAKEFLAGS) -s -f "$(abs_top_builddir)/docs/Makefile" SPELLCHECK_INTERACTIVE="true" SPELLCHECK_SRC="" SPELLCHECK_SRC_ONE="$${docsrc}" SPELLCHECK_BUILDDIR="$(SPELLCHECK_BUILDDIR)" SPELLCHECK_SRCDIR="$(SPELLCHECK_SRCDIR)" "$(SPELLCHECK_BUILDDIR)/$${docsrc}-spellchecked" \
+		$(MAKE) $(AM_MAKEFLAGS) -s -f "$(abs_top_builddir)/docs/Makefile" SPELLCHECK_INTERACTIVE="true" SPELLCHECK_SRC="" SPELLCHECK_SRC_ONE="$${docsrc}" SPELLCHECK_BUILDDIR="$(SPELLCHECK_BUILDDIR)" SPELLCHECK_SRCDIR="$(SPELLCHECK_SRCDIR)" VPATH="$(SPELLCHECK_SRCDIR):$(SPELLCHECK_BUILDDIR):$(VPATH)" "$(SPELLCHECK_BUILDDIR)/$${docsrc}-spellchecked" \
 		|| FAILED="$$FAILED $(SPELLCHECK_SRCDIR)/$$docsrc"; \
 	 done ; \
 	 if test -n "$$FAILED" ; then \
@@ -1131,6 +1131,9 @@ $(abs_top_builddir)/docs/.prep-src-docs: $(PREP_SRC) Makefile
 	                    cd "$(abs_top_builddir)" ; \
 	                fi ;; \
 	        esac ; \
+	        case "$$F" in \
+	        *.xml|*.xsl|*.css|*.jpg|*.png|*.pdn|*.svg) ;; \
+	        *.txt|*.adoc|*.in|*.sample|*.conf|*) \
 	        if $$MAN_SECTIONS_DEFAULT ; then \
 	            sed \
 	                -e 's,\(home page:\) https://www.networkupstools.org/*$$,\1 $(NUT_WEBSITE_BASE)/,' ; \
@@ -1142,7 +1145,8 @@ $(abs_top_builddir)/docs/.prep-src-docs: $(PREP_SRC) Makefile
 	                -e 's,\(linkman:[^ []*\[\)8\],\1$(MAN_SECTION_CMD_SYS)],g' \
 	                -e 's,\(linkman:[^ []*\[\)1\],\1$(MAN_SECTION_CMD_USR)],g' \
 	                -e 's,\(linkman:[^ []*\[\)7\],\1$(MAN_SECTION_MISC)],g' ; \
-	        fi < "$${F}" > "$${F}-prepped" || exit ; \
+	        fi < "$${F}" > "$${F}-prepped" || exit ;; \
+	        esac; \
 	        COUNT="`expr $$COUNT + 1`" ; \
 	    done ; \
 	    if ! test -e "$@" ; then touch "$@" ; fi ; \
@@ -1188,6 +1192,9 @@ $(abs_top_builddir)/docs/.prep-src-docs: $(PREP_SRC) Makefile
 	        if $$IS_TEXT ; then \
 	            grep -w linkman "$${linkroot}/$${F}" > /dev/null || IS_TEXT=false ; \
 	        fi ; \
+	        case "$$F" in \
+	        *.xml|*.xsl|*.css|*.jpg|*.png|*.pdn|*.svg) ;; \
+	        *.txt|*.adoc|*.in|*.sample|*.conf|*) \
 	        if $$MAN_SECTIONS_DEFAULT || ! $$IS_TEXT ; then \
 	            sed \
 	                -e 's,\(home page:\) https://www.networkupstools.org/*$$,\1 $(NUT_WEBSITE_BASE)/,' ; \
@@ -1200,7 +1207,8 @@ $(abs_top_builddir)/docs/.prep-src-docs: $(PREP_SRC) Makefile
 	                -e 's,\(linkman:[^ []*\[\)1\],\1$(MAN_SECTION_CMD_USR)],g' \
 	                -e 's,\(linkman:[^ []*\[\)7\],\1$(MAN_SECTION_MISC)],g' ; \
 	        fi < "$${linkroot}/$${F}" > "$${linkroot}/$${F}-prepped" \
-	        || { rm -f "$@.working" ; exit 1 ; } ; \
+	        || { rm -f "$@.working" ; exit 1 ; } ;; \
+	        esac ; \
 	        COUNT="`expr $$COUNT + 1`" ; \
 	    done ; \
 	 fi ; \
diff --git a/docs/man/Makefile.am b/docs/man/Makefile.am
index f8d4471128..a339b7ea0c 100644
--- a/docs/man/Makefile.am
+++ b/docs/man/Makefile.am
@@ -2065,6 +2065,9 @@ $(abs_top_builddir)/docs/man/.prep-src-docs: $(PREP_SRC) Makefile
 	                    cd "$(abs_top_builddir)" ; \
 	                fi ;; \
 	        esac ; \
+	        case "$$F" in \
+	        *.xml|*.xsl|*.css|*.jpg|*.png|*.pdn|*.svg) ;; \
+	        *.txt|*.adoc|*.in|*.sample|*.conf|*) \
 	        if $$MAN_SECTIONS_DEFAULT ; then \
 	            sed \
 	                -e 's,\(home page:\) https://www.networkupstools.org/*$$,\1 $(NUT_WEBSITE_BASE)/,' ; \
@@ -2081,7 +2084,8 @@ $(abs_top_builddir)/docs/man/.prep-src-docs: $(PREP_SRC) Makefile
 	                -e '1 s,\(^.*(\)8)$$,\1$(MAN_SECTION_CMD_SYS)),g' \
 	                -e '1 s,\(^.*(\)1)$$,\1$(MAN_SECTION_CMD_USR)),g' \
 	                -e '1 s,\(^.*(\)7)$$,\1$(MAN_SECTION_MISC)),g' ; \
-	        fi < "$${F}" > "$${F}-prepped" || exit ; \
+	        fi < "$${F}" > "$${F}-prepped" || exit ;; \
+	        esac ; \
 	        COUNT="`expr $$COUNT + 1`" ; \
 	    done ; \
 	 else \
@@ -2126,6 +2130,9 @@ $(abs_top_builddir)/docs/man/.prep-src-docs: $(PREP_SRC) Makefile
 	        if $$IS_TEXT ; then \
 	            grep -w linkman "$${linkroot}/$${F}" > /dev/null || IS_TEXT=false ; \
 	        fi ; \
+	        case "$$F" in \
+	        *.xml|*.xsl|*.css|*.jpg|*.png|*.pdn|*.svg) ;; \
+	        *.txt|*.adoc|*.in|*.sample|*.conf|*) \
 	        if $$MAN_SECTIONS_DEFAULT || ! $$IS_TEXT ; then \
 	            sed \
 	                -e 's,\(home page:\) https://www.networkupstools.org/*$$,\1 $(NUT_WEBSITE_BASE)/,' ; \
@@ -2143,7 +2150,8 @@ $(abs_top_builddir)/docs/man/.prep-src-docs: $(PREP_SRC) Makefile
 	                -e '1 s,\(^.*(\)1)$$,\1$(MAN_SECTION_CMD_USR)),g' \
 	                -e '1 s,\(^.*(\)7)$$,\1$(MAN_SECTION_MISC)),g' ; \
 	        fi < "$${linkroot}/$${F}" > "$${linkroot}/$${F}-prepped" \
-	        || { rm -f "$@.working" ; exit 1 ; } ; \
+	        || { rm -f "$@.working" ; exit 1 ; } ;; \
+	        esac ; \
 	        COUNT="`expr $$COUNT + 1`" ; \
 	    done ; \
 	 fi ; \
diff --git a/scripts/systemd/nutshutdown.in b/scripts/systemd/nutshutdown.in
index 0af98b28e9..be0b55861b 100755
--- a/scripts/systemd/nutshutdown.in
+++ b/scripts/systemd/nutshutdown.in
@@ -1,6 +1,7 @@
 #!/bin/sh
 
-# Network UPS Tools (NUT) systemd-shutdown integration handler.
+# Network UPS Tools (NUT) systemd-shutdown integration handler for UPS power
+# cycling (or power-off) and power-race avoidance.
 #
 # NOTE: This script requires both nut-server package (or more specifically,
 # the drivers for your device, which may be in further packages grouped
@@ -8,6 +9,10 @@
 # and their configuration files to be present locally and on still-mounted
 # filesystems (may be read-only).
 #
+# It is typically installed as /usr/lib/systemd/system-shutdown/nutshutdown
+# but other OSes and service management frameworks may also use an adapted
+# variant of this script.
+#
 # Copyright (C) 2011-2025 by NUT contributors
 # Michal Hlavinka, Laurent Bigonville, Arnaud Quette, Jim Klimov et al.
 #