Merge pull request #25 from sue445/feature/tweak_comment

Tweak comment

Author: sue445

wrapper.go

@@ -14,7 +14,7 @@ func String2Char(str string) *Char {
 	return (*Char)(string2Char(str))
 }
 
-// string2Char convert from Go string to `*C.char`
+// string2Char convert from Go string to `*C.char`. (for internal use within package)
 func string2Char(str string) *C.char {
 	bytes := append([]byte(str), '\000')
 
@@ -26,7 +26,7 @@ func Value2String(str VALUE) string {
 	return value2String(C.VALUE(str))
 }
 
-// value2String convert from `C.VALUE` to Go string
+// value2String convert from `C.VALUE` to Go string. (for internal use within package)
 func value2String(str C.VALUE) string {
 	return C.GoStringN(rstringPtr(str), rstringLenint(str))
 }
@@ -36,7 +36,7 @@ func StringLen(str string) Long {
 	return Long(stringLen(str))
 }
 
-// stringLen returns string length as `C.long`
+// stringLen returns string length as `C.long`. (for internal use within package)
 func stringLen(str string) C.long {
 	return C.long(len(str))
 }
@@ -46,7 +46,7 @@ func String2Value(str string) VALUE {
 	return VALUE(string2Value(str))
 }
 
-// string2Value convert from Go string to `C.VALUE`
+// string2Value convert from Go string to `C.VALUE`. (for internal use within package)
 func string2Value(str string) C.VALUE {
 	if len(str) == 0 {
 		return rbUtf8StrNew(nil, C.long(0))