diff --git a/encoding.go b/encoding.go
index 1adce33..669c694 100644
--- a/encoding.go
+++ b/encoding.go
@@ -40,100 +40,100 @@ const (
 )
 
 const (
-	// CharsetUTF7 represents the "UTF-7" charset
+	// CharsetUTF7 represents the "UTF-7" charset.
 	CharsetUTF7 Charset = "UTF-7"
 
-	// CharsetUTF8 represents the "UTF-8" charset
+	// CharsetUTF8 represents the "UTF-8" charset.
 	CharsetUTF8 Charset = "UTF-8"
 
-	// CharsetASCII represents the "US-ASCII" charset
+	// CharsetASCII represents the "US-ASCII" charset.
 	CharsetASCII Charset = "US-ASCII"
 
-	// CharsetISO88591 represents the "ISO-8859-1" charset
+	// CharsetISO88591 represents the "ISO-8859-1" charset.
 	CharsetISO88591 Charset = "ISO-8859-1"
 
-	// CharsetISO88592 represents the "ISO-8859-2" charset
+	// CharsetISO88592 represents the "ISO-8859-2" charset.
 	CharsetISO88592 Charset = "ISO-8859-2"
 
-	// CharsetISO88593 represents the "ISO-8859-3" charset
+	// CharsetISO88593 represents the "ISO-8859-3" charset.
 	CharsetISO88593 Charset = "ISO-8859-3"
 
-	// CharsetISO88594 represents the "ISO-8859-4" charset
+	// CharsetISO88594 represents the "ISO-8859-4" charset.
 	CharsetISO88594 Charset = "ISO-8859-4"
 
-	// CharsetISO88595 represents the "ISO-8859-5" charset
+	// CharsetISO88595 represents the "ISO-8859-5" charset.
 	CharsetISO88595 Charset = "ISO-8859-5"
 
-	// CharsetISO88596 represents the "ISO-8859-6" charset
+	// CharsetISO88596 represents the "ISO-8859-6" charset.
 	CharsetISO88596 Charset = "ISO-8859-6"
 
-	// CharsetISO88597 represents the "ISO-8859-7" charset
+	// CharsetISO88597 represents the "ISO-8859-7" charset.
 	CharsetISO88597 Charset = "ISO-8859-7"
 
-	// CharsetISO88599 represents the "ISO-8859-9" charset
+	// CharsetISO88599 represents the "ISO-8859-9" charset.
 	CharsetISO88599 Charset = "ISO-8859-9"
 
-	// CharsetISO885913 represents the "ISO-8859-13" charset
+	// CharsetISO885913 represents the "ISO-8859-13" charset.
 	CharsetISO885913 Charset = "ISO-8859-13"
 
-	// CharsetISO885914 represents the "ISO-8859-14" charset
+	// CharsetISO885914 represents the "ISO-8859-14" charset.
 	CharsetISO885914 Charset = "ISO-8859-14"
 
-	// CharsetISO885915 represents the "ISO-8859-15" charset
+	// CharsetISO885915 represents the "ISO-8859-15" charset.
 	CharsetISO885915 Charset = "ISO-8859-15"
 
-	// CharsetISO885916 represents the "ISO-8859-16" charset
+	// CharsetISO885916 represents the "ISO-8859-16" charset.
 	CharsetISO885916 Charset = "ISO-8859-16"
 
-	// CharsetISO2022JP represents the "ISO-2022-JP" charset
+	// CharsetISO2022JP represents the "ISO-2022-JP" charset.
 	CharsetISO2022JP Charset = "ISO-2022-JP"
 
-	// CharsetISO2022KR represents the "ISO-2022-KR" charset
+	// CharsetISO2022KR represents the "ISO-2022-KR" charset.
 	CharsetISO2022KR Charset = "ISO-2022-KR"
 
-	// CharsetWindows1250 represents the "windows-1250" charset
+	// CharsetWindows1250 represents the "windows-1250" charset.
 	CharsetWindows1250 Charset = "windows-1250"
 
-	// CharsetWindows1251 represents the "windows-1251" charset
+	// CharsetWindows1251 represents the "windows-1251" charset.
 	CharsetWindows1251 Charset = "windows-1251"
 
-	// CharsetWindows1252 represents the "windows-1252" charset
+	// CharsetWindows1252 represents the "windows-1252" charset.
 	CharsetWindows1252 Charset = "windows-1252"
 
-	// CharsetWindows1255 represents the "windows-1255" charset
+	// CharsetWindows1255 represents the "windows-1255" charset.
 	CharsetWindows1255 Charset = "windows-1255"
 
-	// CharsetWindows1256 represents the "windows-1256" charset
+	// CharsetWindows1256 represents the "windows-1256" charset.
 	CharsetWindows1256 Charset = "windows-1256"
 
-	// CharsetKOI8R represents the "KOI8-R" charset
+	// CharsetKOI8R represents the "KOI8-R" charset.
 	CharsetKOI8R Charset = "KOI8-R"
 
-	// CharsetKOI8U represents the "KOI8-U" charset
+	// CharsetKOI8U represents the "KOI8-U" charset.
 	CharsetKOI8U Charset = "KOI8-U"
 
-	// CharsetBig5 represents the "Big5" charset
+	// CharsetBig5 represents the "Big5" charset.
 	CharsetBig5 Charset = "Big5"
 
-	// CharsetGB18030 represents the "GB18030" charset
+	// CharsetGB18030 represents the "GB18030" charset.
 	CharsetGB18030 Charset = "GB18030"
 
-	// CharsetGB2312 represents the "GB2312" charset
+	// CharsetGB2312 represents the "GB2312" charset.
 	CharsetGB2312 Charset = "GB2312"
 
-	// CharsetTIS620 represents the "TIS-620" charset
+	// CharsetTIS620 represents the "TIS-620" charset.
 	CharsetTIS620 Charset = "TIS-620"
 
-	// CharsetEUCKR represents the "EUC-KR" charset
+	// CharsetEUCKR represents the "EUC-KR" charset.
 	CharsetEUCKR Charset = "EUC-KR"
 
-	// CharsetShiftJIS represents the "Shift_JIS" charset
+	// CharsetShiftJIS represents the "Shift_JIS" charset.
 	CharsetShiftJIS Charset = "Shift_JIS"
 
-	// CharsetUnknown represents the "Unknown" charset
+	// CharsetUnknown represents the "Unknown" charset.
 	CharsetUnknown Charset = "Unknown"
 
-	// CharsetGBK represents the "GBK" charset
+	// CharsetGBK represents the "GBK" charset.
 	CharsetGBK Charset = "GBK"
 )