diff --git a/README.md b/README.md
index dd68f7b..14f085a 100644
--- a/README.md
+++ b/README.md
@@ -312,7 +312,7 @@ itembtn3 = types.KeyboardButton('d')
 markup.add(itembtn1, itembtn2, itembtn3)
 tb.send_message(chat_id, "Choose one letter:", reply_markup=markup)
 
-# or add strings one row at a time:
+# or add KeyboardButton one row at a time:
 markup = types.ReplyKeyboardMarkup()
 itembtna = types.KeyboardButton('a')
 itembtnv = types.KeyboardButton('v')
diff --git a/telebot/types.py b/telebot/types.py
index c6f7d10..993307d 100644
--- a/telebot/types.py
+++ b/telebot/types.py
@@ -564,7 +564,10 @@ class ReplyKeyboardMarkup(JsonSerializable):
         :param args: strings
         :return: self, to allow function chaining.
         """
-        self.keyboard.append(args)
+        btn_array = []
+        for button in args:
+            btn_array.append(button.to_dic())
+        self.keyboard.append(btn_array)
         return self
 
     def to_json(self):
@@ -638,7 +641,10 @@ class InlineKeyboardMarkup(Dictionaryable, JsonSerializable):
         :param args: strings
         :return: self, to allow function chaining.
         """
-        self.keyboard.append(args)
+        btn_array = []
+        for button in args:
+            btn_array.append(button.to_dic())
+        self.keyboard.append(btn_array)
         return self
 
     def to_json(self):
@@ -1296,6 +1302,7 @@ class InlineQueryResultCachedMpeg4Gif(BaseInlineQueryResultCached):
         self.input_message_content = input_message_content
         self.payload_dic['mpeg4_file_id'] = mpeg4_file_id
 
+
 class InlineQueryResultCachedSticker(BaseInlineQueryResultCached):
     def __init__(self, id, sticker_file_id, reply_markup=None, input_message_content=None):
         BaseInlineQueryResultCached.__init__(self)