diff --git a/patches/pkgbuild/groff.sh b/patches/pkgbuild/groff.sh
index d2730c6..34de981 100755
--- a/patches/pkgbuild/groff.sh
+++ b/patches/pkgbuild/groff.sh
@@ -49,6 +49,24 @@ lines[i:i] = [
     ind + "# decision groff would have made had it checked.",
     ind + 'sed -i "/^PROCESSEDEXAMPLEFILES_PS = /,/^$/ s|^.*$||" Makefile',
     ind + 'grep -q "^PROCESSEDEXAMPLEFILES_PS" Makefile && { echo "groff: PS example list not emptied" >&2; exit 1; }',
+    ind + "# THE SECOND consumer. Two files include the logo, and only two --",
+    ind + "# counted rather than guessed:",
+    ind + "#",
+    ind + "#   doc/webpage.ms                             (above)",
+    ind + "#   contrib/hdtbl/examples/mixed_pickles.roff  (this)",
+    ind + "#",
+    ind + "# hdtbl renders its example tables to PostScript, and one of them shows",
+    ind + "# the GNU logo. HDTBLPROCESSEDEXAMPLEFILES lists all twelve; the whole",
+    ind + "# list goes, because there is no reason to render eleven examples of a",
+    ind + "# table macro package into a documentation set nothing here reads.",
+    ind + 'sed -i "/^HDTBLPROCESSEDEXAMPLEFILES = /,/^$/ s|^.*$||" Makefile',
+    ind + 'grep -q "^HDTBLPROCESSEDEXAMPLEFILES" Makefile && { echo "groff: hdtbl example list not emptied" >&2; exit 1; }',
+    ind + "# And say it out loud: if a THIRD consumer appears, this is the pattern",
+    ind + "# to look for, not a new kind of problem.",
+    ind + 'if grep -rl "gnu\\.eps" --include="*.roff" --include="*.ms" . 2>/dev/null | grep -qv "^\\./doc/webpage.ms$\\|mixed_pickles"; then',
+    ind + '  echo "groff: a third file includes gnu.eps; see patches/pkgbuild/groff.sh" >&2',
+    ind + '  exit 1',
+    ind + 'fi',
 ]
 io.open("PKGBUILD", "w", encoding="utf-8").write("\n".join(lines))
 ZZPY