diff --git a/.travis.yml b/.travis.yml
index 8408fb7..5769aa1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: go
 
 go:
-  - 1.4
-  - tip
\ No newline at end of file
+  - '1.10'
+  - '1.11'
+  - tip
diff --git a/bot.go b/bot.go
index 8fb6200..35d1e25 100644
--- a/bot.go
+++ b/bot.go
@@ -9,7 +9,6 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
-	"log"
 	"net/http"
 	"net/url"
 	"os"
diff --git a/configs.go b/configs.go
index 08aa491..a750182 100644
--- a/configs.go
+++ b/configs.go
@@ -253,9 +253,9 @@ func (config PhotoConfig) params() (map[string]string, error) {
 
 	if config.Caption != "" {
 		params["caption"] = config.Caption
-	}
-	if config.ParseMode != "" {
-		params["parse_mode"] = config.ParseMode
+		if config.ParseMode != "" {
+			params["parse_mode"] = config.ParseMode
+		}
 	}
 
 	return params, nil
@@ -271,10 +271,11 @@ func (config PhotoConfig) values() (url.Values, error) {
 	v.Add(config.name(), config.FileID)
 	if config.Caption != "" {
 		v.Add("caption", config.Caption)
+		if config.ParseMode != "" {
+			v.Add("parse_mode", config.ParseMode)
+		}
 	}
-	if config.ParseMode != "" {
-		v.Add("parse_mode", config.ParseMode)
-	}
+
 	return v, nil
 }
 
@@ -292,6 +293,7 @@ func (config PhotoConfig) method() string {
 type AudioConfig struct {
 	BaseFile
 	Caption   string
+	ParseMode string
 	Duration  int
 	Performer string
 	Title     string
@@ -317,6 +319,9 @@ func (config AudioConfig) values() (url.Values, error) {
 	}
 	if config.Caption != "" {
 		v.Add("caption", config.Caption)
+		if config.ParseMode != "" {
+			v.Add("parse_mode", config.ParseMode)
+		}
 	}
 
 	return v, nil
@@ -338,6 +343,9 @@ func (config AudioConfig) params() (map[string]string, error) {
 	}
 	if config.Caption != "" {
 		params["caption"] = config.Caption
+		if config.ParseMode != "" {
+			params["parse_mode"] = config.ParseMode
+		}
 	}
 
 	return params, nil
@@ -356,7 +364,8 @@ func (config AudioConfig) method() string {
 // DocumentConfig contains information about a SendDocument request.
 type DocumentConfig struct {
 	BaseFile
-	Caption string
+	Caption   string
+	ParseMode string
 }
 
 // values returns a url.Values representation of DocumentConfig.
@@ -369,6 +378,9 @@ func (config DocumentConfig) values() (url.Values, error) {
 	v.Add(config.name(), config.FileID)
 	if config.Caption != "" {
 		v.Add("caption", config.Caption)
+		if config.ParseMode != "" {
+			v.Add("parse_mode", config.ParseMode)
+		}
 	}
 
 	return v, nil
@@ -380,6 +392,9 @@ func (config DocumentConfig) params() (map[string]string, error) {
 
 	if config.Caption != "" {
 		params["caption"] = config.Caption
+		if config.ParseMode != "" {
+			params["parse_mode"] = config.ParseMode
+		}
 	}
 
 	return params, nil
@@ -432,8 +447,9 @@ func (config StickerConfig) method() string {
 // VideoConfig contains information about a SendVideo request.
 type VideoConfig struct {
 	BaseFile
-	Duration int
-	Caption  string
+	Duration  int
+	Caption   string
+	ParseMode string
 }
 
 // values returns a url.Values representation of VideoConfig.
@@ -449,6 +465,9 @@ func (config VideoConfig) values() (url.Values, error) {
 	}
 	if config.Caption != "" {
 		v.Add("caption", config.Caption)
+		if config.ParseMode != "" {
+			v.Add("parse_mode", config.ParseMode)
+		}
 	}
 
 	return v, nil
@@ -460,6 +479,9 @@ func (config VideoConfig) params() (map[string]string, error) {
 
 	if config.Caption != "" {
 		params["caption"] = config.Caption
+		if config.ParseMode != "" {
+			params["parse_mode"] = config.ParseMode
+		}
 	}
 
 	return params, nil
@@ -529,8 +551,9 @@ func (config VideoNoteConfig) method() string {
 // VoiceConfig contains information about a SendVoice request.
 type VoiceConfig struct {
 	BaseFile
-	Caption  string
-	Duration int
+	Caption   string
+	ParseMode string
+	Duration  int
 }
 
 // values returns a url.Values representation of VoiceConfig.
@@ -546,6 +569,9 @@ func (config VoiceConfig) values() (url.Values, error) {
 	}
 	if config.Caption != "" {
 		v.Add("caption", config.Caption)
+		if config.ParseMode != "" {
+			v.Add("parse_mode", config.ParseMode)
+		}
 	}
 
 	return v, nil
@@ -560,6 +586,9 @@ func (config VoiceConfig) params() (map[string]string, error) {
 	}
 	if config.Caption != "" {
 		params["caption"] = config.Caption
+		if config.ParseMode != "" {
+			params["parse_mode"] = config.ParseMode
+		}
 	}
 
 	return params, nil
@@ -801,7 +830,9 @@ func (config EditMessageCaptionConfig) values() (url.Values, error) {
 	v, _ := config.BaseEdit.values()
 
 	v.Add("caption", config.Caption)
-	v.Add("parse_mode", config.ParseMode)
+	if config.ParseMode != "" {
+		v.Add("parse_mode", config.ParseMode)
+	}
 
 	return v, nil
 }
diff --git a/helpers.go b/helpers.go
index 310319f..ccbdeee 100644
--- a/helpers.go
+++ b/helpers.go
@@ -1,7 +1,6 @@
 package tgbotapi
 
 import (
-	"log"
 	"net/url"
 )
 
diff --git a/log.go b/log.go
new file mode 100644
index 0000000..18e339f
--- /dev/null
+++ b/log.go
@@ -0,0 +1,17 @@
+package tgbotapi
+
+import (
+	"os"
+	"errors"
+	stdlog "log"
+)
+
+var log = stdlog.New(os.Stderr, "", stdlog.LstdFlags)
+
+func SetLogger(newLog *stdlog.Logger) error {
+	if newLog == nil {
+		return errors.New("logger is nil")
+	}
+	log = newLog
+	return nil
+}