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-rw-r--r--doc/Makefile4
1 files changed, 2 insertions, 2 deletions
diff --git a/doc/Makefile b/doc/Makefile
index 8e0f283..9cd37e5 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -11,9 +11,9 @@ all: breaking_rules.pdf breaking_rules.html
 breaking_rules.pdf: macros.ms breaking_rules.md refs.i
 	( cat macros.ms; lowdown -sTms breaking_rules.md ) | pdfroff -i -t -R -mspdf -k -Kutf8 > $@
 
-# Headers aren't emitted currently
+# On macOS only, headers aren't emitted currently
 breaking_rules.html: macros.ms breaking_rules.md refs.i
-	( cat macros.ms; lowdown -sTms breaking_rules.md ) | groff -Thtml -i -t -R -ms -k -Kutf8 > $@
+	( cat macros.ms; lowdown -sTms breaking_rules.md ) | groff -Txhtml -i -t -R -ms -k -Kutf8 > $@
 
 refs.i: refs
 	indxbib $^