diff --git a/contrib/mandoc/mandocdb.c b/contrib/mandoc/mandocdb.c
--- a/contrib/mandoc/mandocdb.c
+++ b/contrib/mandoc/mandocdb.c
@@ -258,7 +258,7 @@
 	{ NULL, TYPE_Em, 0 },  /* Em */
 	{ NULL, 0, 0 },  /* Eo */
 	{ NULL, TYPE_Fx, NODE_NOSRC },  /* Fx */
-	{ NULL, TYPE_Ms, 0 },  /* Ms */
+	{ NULL, 0, 0 },  /* Ms */
 	{ NULL, 0, 0 },  /* No */
 	{ NULL, 0, 0 },  /* Ns */
 	{ NULL, TYPE_Nx, NODE_NOSRC },  /* Nx */
@@ -307,6 +307,7 @@
 	{ NULL, 0, 0 },  /* %Q */
 	{ NULL, 0, 0 },  /* %U */
 	{ NULL, 0, 0 },  /* Ta */
+	{ NULL, TYPE_Sl, 0 },  /* Sl */
 };
 
 
diff --git a/contrib/mandoc/mansearch.h b/contrib/mandoc/mansearch.h
--- a/contrib/mandoc/mansearch.h
+++ b/contrib/mandoc/mansearch.h
@@ -59,7 +59,7 @@
 #define	TYPE_Nx		 0x0000000020000000ULL
 #define	TYPE_Fx		 0x0000000040000000ULL
 #define	TYPE_Lk		 0x0000000080000000ULL
-#define	TYPE_Ms		 0x0000000100000000ULL
+#define	TYPE_Sl		 0x0000000100000000ULL
 #define	TYPE_Bsx	 0x0000000200000000ULL
 #define	TYPE_Dx		 0x0000000400000000ULL
 #define	TYPE_Rs		 0x0000000800000000ULL
diff --git a/contrib/mandoc/mansearch.c b/contrib/mandoc/mansearch.c
--- a/contrib/mandoc/mansearch.c
+++ b/contrib/mandoc/mansearch.c
@@ -57,7 +57,7 @@
 	"Ic",	"Pa",	"Cm",	"Li",	"Em",	"Cd",	"Va",	"Ft",
 	"Tn",	"Er",	"Ev",	"Sy",	"Sh",	"In",	"Ss",	"Ox",
 	"An",	"Mt",	"St",	"Bx",	"At",	"Nx",	"Fx",	"Lk",
-	"Ms",	"Bsx",	"Dx",	"Rs",	"Vt",	"Lb",	"Nm",	"Nd"
+	"Sl",	"Bsx",	"Dx",	"Rs",	"Vt",	"Lb",	"Nm",	"Nd"
 };
 
 
diff --git a/contrib/mandoc/mdoc_argv.c b/contrib/mandoc/mdoc_argv.c
--- a/contrib/mandoc/mdoc_argv.c
+++ b/contrib/mandoc/mdoc_argv.c
@@ -265,6 +265,7 @@
 	{ ARGSFL_NONE, NULL }, /* %Q */
 	{ ARGSFL_NONE, NULL }, /* %U */
 	{ ARGSFL_NONE, NULL }, /* Ta */
+	{ ARGSFL_DELIM, NULL }, /* Sl */
 };
 
 
diff --git a/contrib/mandoc/mdoc_html.c b/contrib/mandoc/mdoc_html.c
--- a/contrib/mandoc/mdoc_html.c
+++ b/contrib/mandoc/mdoc_html.c
@@ -241,6 +241,7 @@
 	{mdoc__x_pre, mdoc__x_post}, /* %Q */
 	{mdoc__x_pre, mdoc__x_post}, /* %U */
 	{NULL, NULL}, /* Ta */
+	{NULL, NULL}, /* Sl */
 };
 
 
diff --git a/contrib/mandoc/mdoc_macro.c b/contrib/mandoc/mdoc_macro.c
--- a/contrib/mandoc/mdoc_macro.c
+++ b/contrib/mandoc/mdoc_macro.c
@@ -200,6 +200,7 @@
 	{ in_line_eoln, MDOC_JOIN }, /* %Q */
 	{ in_line_eoln, 0 }, /* %U */
 	{ phrase_ta, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Ta */
+	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED }, /* Sl */
 };
 
 
@@ -1403,6 +1404,7 @@
 		break;
 	case MDOC_Bx:
 	case MDOC_Es:
+	case MDOC_Sl:
 	case MDOC_Xr:
 		maxargs = 2;
 		break;
diff --git a/contrib/mandoc/mdoc_man.c b/contrib/mandoc/mdoc_man.c
--- a/contrib/mandoc/mdoc_man.c
+++ b/contrib/mandoc/mdoc_man.c
@@ -262,6 +262,7 @@
 	{ NULL, NULL, post_percent, NULL, NULL }, /* %Q */
 	{ NULL, NULL, post_percent, NULL, NULL }, /* %U */
 	{ NULL, NULL, NULL, NULL, NULL }, /* Ta */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Sl */
 };
 static const struct mdoc_man_act *mdoc_man_act(enum roff_tok);
 
diff --git a/contrib/mandoc/mdoc_markdown.c b/contrib/mandoc/mdoc_markdown.c
--- a/contrib/mandoc/mdoc_markdown.c
+++ b/contrib/mandoc/mdoc_markdown.c
@@ -226,6 +226,7 @@
 	{ NULL, NULL, md_post_pc, NULL, NULL }, /* %Q */
 	{ NULL, md_pre_Lk, md_post_pc, NULL, NULL }, /* %U */
 	{ NULL, NULL, NULL, NULL, NULL }, /* Ta */
+	{ NULL, NULL, NULL, NULL, NULL }, /* Sl */
 };
 static const struct md_act *md_act(enum roff_tok);
 
diff --git a/contrib/mandoc/mdoc_state.c b/contrib/mandoc/mdoc_state.c
--- a/contrib/mandoc/mdoc_state.c
+++ b/contrib/mandoc/mdoc_state.c
@@ -157,6 +157,7 @@
 	NULL,		/* %Q */
 	NULL,		/* %U */
 	NULL,		/* Ta */
+	NULL,		/* Sl */
 };
 
 
diff --git a/contrib/mandoc/mdoc_term.c b/contrib/mandoc/mdoc_term.c
--- a/contrib/mandoc/mdoc_term.c
+++ b/contrib/mandoc/mdoc_term.c
@@ -116,6 +116,7 @@
 static	int	  termp_skip_pre(DECL_ARGS);
 static	int	  termp_sm_pre(DECL_ARGS);
 static	int	  termp_pp_pre(DECL_ARGS);
+static	int	  termp_sl_pre(DECL_ARGS);
 static	int	  termp_ss_pre(DECL_ARGS);
 static	int	  termp_sy_pre(DECL_ARGS);
 static	int	  termp_tag_pre(DECL_ARGS);
@@ -245,6 +246,7 @@
 	{ NULL, termp____post }, /* %Q */
 	{ NULL, termp____post }, /* %U */
 	{ NULL, NULL }, /* Ta */
+	{ termp_sl_pre, NULL }, /* Sl */
 };
 
 static	int	 fn_prio;
@@ -1576,6 +1578,21 @@
 	return 1;
 }
 
+static int
+termp_sl_pre(DECL_ARGS)
+{
+
+	synopsis_pre(p, n);
+
+	if ((n->flags & NODE_SYNPRETTY) && (n->flags & NODE_LINE)) {
+		term_fontpush(p, TERMFONT_BOLD);
+		term_word(p, "sysctl:");
+	}
+	term_fontpush(p, TERMFONT_UNDER);
+
+	return 1;
+}
+
 static int
 termp_in_pre(DECL_ARGS)
 {
diff --git a/contrib/mandoc/roff.h b/contrib/mandoc/roff.h
--- a/contrib/mandoc/roff.h
+++ b/contrib/mandoc/roff.h
@@ -437,6 +437,7 @@
 	MDOC__Q,
 	MDOC__U,
 	MDOC_Ta,
+	MDOC_Sl,
 	MDOC_MAX,
 	MAN_TH,
 	MAN_SH,
diff --git a/contrib/mandoc/roff.c b/contrib/mandoc/roff.c
--- a/contrib/mandoc/roff.c
+++ b/contrib/mandoc/roff.c
@@ -355,6 +355,7 @@
 	"Lk",		"Mt",		"Brq",		"Bro",
 	"Brc",		"%C",		"Es",		"En",
 	"Dx",		"%Q",		"%U",		"Ta",
+	"Sl",
 	NULL,
 	"TH",		"SH",		"SS",		"TP",
 	"TQ",
diff --git a/share/man/man4/xhci.4 b/share/man/man4/xhci.4
--- a/share/man/man4/xhci.4
+++ b/share/man/man4/xhci.4
@@ -32,6 +32,7 @@
 .Nd USB eXtensible Host Controller driver
 .Sh SYNOPSIS
 .Cd "device xhci"
+.Sl hw.usb.xhci.debug
 .Sh DESCRIPTION
 The
 .Nm
@@ -63,7 +64,7 @@
 .Xr loader 8
 tunables:
 .Bl -tag -width indent
-.It Va hw.usb.xhci.debug
+.It Sl hw.usb.xhci.debug
 Debug output level, where 0 is debugging disabled and larger values increase
 debug message verbosity.
 Default is 0.
diff --git a/usr.bin/man/man.sh b/usr.bin/man/man.sh
--- a/usr.bin/man/man.sh
+++ b/usr.bin/man/man.sh
@@ -532,7 +532,14 @@
 	done
 	unset IFS
 
-	# Nothing? Well, we are done then.
+	# Nothing? Try sysctl search using apropos.
+	path=$(apropos -w Sl=$1 2>/dev/null)
+	if [ $? = 0 ]; then
+		found_page=yes
+		man_find_and_display $path
+	fi
+
+	# Still nothing? Well, we are done then.
 	if [ -z "$found_page" ]; then
 		echo "No manual entry for $1" >&2
 		ret=1