diff -ur v4/ezmd.py v5/ezmd.py
--- v4/ezmd.py	2019-09-25 00:23:47.000000000 +0900
+++ v5/ezmd.py	2019-09-26 21:40:15.000000000 +0900
@@ -7,12 +7,24 @@
 heads = [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'h7', 'h8', 'h9' ]
 modes = heads + [ 'p', 'pre', 'ul' ]
 
-def is_mode_switch(s, mode):
+is_all_ge_n = lambda s, c, n: all( map( lambda c_: c_ == c, s ) ) and len(s) >= n
+
+def next_mode_switch(s, mode):
 	if mode == 'pre':
-		return s == '/'
-	return s in modes and s != mode
+		return (None, 'p') if s == '/' else (s, mode)
+
+	if s in modes:
+		return (None, s) if s != mode else (None, mode)
+
+	if is_all_ge_n(s, '-', 4):
+		return (s, 'hr')
+
+	if mode == 'hr':
+		if is_all_ge_n(s, '-', 4):
+			return (s, 'hr')
+		return (s, 'p')
 
-next_mode = lambda s: 'p' if s == '/' else s
+	return (s, mode)
 
 lst_strip = lambda lst: list( map( lambda s: s.strip(), lst ) )
 
@@ -125,6 +137,8 @@
 			res.append( { 'pre': s } )
 	elif mode == 'ul':
 		do_mode_ul(buf, res)
+	elif mode == 'hr':
+		res.extend( list( map( lambda s: { 'p': { 'hr': '/' } }, buf ) ) )
 
 def ezmd(lst):
 	lst = ['p'] + lst
@@ -132,11 +146,11 @@
 	mode = ''
 	while lst:
 		s = lst.pop(0)
-		if is_mode_switch(s, mode):
+		(s, nmd) = next_mode_switch(s, mode);
+		if nmd != mode:
 			do_mode(mode, buf, res)
-			mode = next_mode(s)
-			buf = []
-		elif s != mode:
+			(mode, buf) = (nmd, [])
+		if s != None:
 			buf.append(s)
 	do_mode(mode, buf, res)
 	return res