diff --git a/README.md b/README.md
index 30b15a3..c3e392f 100644
--- a/README.md
+++ b/README.md
@@ -139,17 +139,10 @@ err = bot.Send(recipient, audio)
 ## Reply markup
 ```go
 // Send a selective force reply message.
-bot.Send(user, "pong", &tb.SendOptions{
-		ReplyMarkup: &tb.ReplyMarkup{
-			ForceReply: true,
-			Selective: true,
-			CustomKeyboard: [][]string{
-				[]string{"1", "2", "3"},
-				[]string{"4", "5", "6"},
-				[]string{"7", "8", "9"},
-				[]string{"*", "0", "#"},
-			},
-		},
-	},
-)
+bot.Send(user, "pong", &tb.ReplyMarkup{
+    ForceReply: true,
+    Selective: true,
+
+    ReplyKeyboard: keys,
+})
 ```
diff --git a/options.go b/options.go
index 8a89c87..9c6bb0e 100644
--- a/options.go
+++ b/options.go
@@ -43,30 +43,35 @@ type SendOptions struct {
 
 // ReplyMarkup specifies convenient options for bot-user communications.
 type ReplyMarkup struct {
-	InlineKeyboard [][]InlineButton `json:"inline_keyboard,omitempty"`
-
 	// ForceReply forces Telegram clients to display
 	// a reply interface to the user (act as if the user
 	// has selected the bot‘s message and tapped "Reply").
 	ForceReply bool `json:"force_reply,omitempty"`
 
-	// CustomKeyboard is a grid, consisting of keyboard buttons.
+	// InlineKeyboard is a grid of InlineButtons displayed in the message.
+	//
+	// Note: DO NOT confuse with ReplyKeyboard and other keyboard properties!
+	InlineKeyboard [][]InlineButton `json:"inline_keyboard,omitempty"`
+
+	// ReplyKeyboard is a grid, consisting of keyboard buttons.
 	//
 	// Note: you don't need to set HideCustomKeyboard field to show custom keyboard.
-	CustomKeyboard [][]KeyboardButton `json:"keyboard,omitempty"`
+	ReplyKeyboard [][]KeyboardButton `json:"keyboard,omitempty"`
 
 	// Requests clients to hide the custom keyboard.
 	//
 	// Note: You dont need to set CustomKeyboard field to hide custom keyboard.
-	HideCustomKeyboard bool `json:"hide_keyboard,omitempty"`
+	HideReplyKeyboard bool `json:"hide_keyboard,omitempty"`
 
 	// Requests clients to resize the keyboard vertically for optimal fit
-	// (e.g., make the keyboard smaller if there are just two rows of buttons).
+	// (e.g. make the keyboard smaller if there are just two rows of buttons).
+	//
 	// Defaults to false, in which case the custom keyboard is always of the
 	// same height as the app's standard keyboard.
-	ResizeKeyboard bool `json:"resize_keyboard,omitempty"`
+	ResizeReplyKeyboard bool `json:"resize_keyboard,omitempty"`
 
-	// Requests clients to hide the keyboard as soon as it's been used.
+	// Requests clients to hide the reply keyboard as soon as it's been used.
+	//
 	// Defaults to false.
 	OneTimeKeyboard bool `json:"one_time_keyboard,omitempty"`
 
diff --git a/util.go b/util.go
index c99ef7d..1453c2b 100644
--- a/util.go
+++ b/util.go
@@ -91,11 +91,12 @@ func embedSendOptions(params map[string]string, opt *SendOptions) {
 	}
 
 	if opt.ReplyMarkup != nil {
-		forceReply := opt.ReplyMarkup.ForceReply
-		customKeyboard := (opt.ReplyMarkup.CustomKeyboard != nil)
-		inlineKeyboard := opt.ReplyMarkup.InlineKeyboard != nil
-		hiddenKeyboard := opt.ReplyMarkup.HideCustomKeyboard
-		if forceReply || customKeyboard || hiddenKeyboard || inlineKeyboard {
+		force := opt.ReplyMarkup.ForceReply
+		reply := opt.ReplyMarkup.ReplyKeyboard != nil
+		inline := opt.ReplyMarkup.InlineKeyboard != nil
+		hidden := opt.ReplyMarkup.HideReplyKeyboard
+		resize := opt.ReplyMarkup.ResizeReplyKeyboard
+		if force || reply || inline || hidden || resize {
 			replyMarkup, _ := json.Marshal(opt.ReplyMarkup)
 			params["reply_markup"] = string(replyMarkup)
 		}