1 files changed, 1 insertions, 0 deletions
diff --git a/roff.3 b/roff.3
index 18b48ad3..30b8aa2b 100644
--- a/roff.3
+++ b/roff.3
@@ -27,6 +27,7 @@
 .Nd roff macro compiler library
 .Sh SYNOPSIS
 .In mandoc.h
+.In regs.h
 .In roff.h
 .Ft "struct roff *"
 .Fn roff_alloc "mandocmsg msgs" "void *data"