diff --git a/cpp/qrcodegen.cpp b/cpp/qrcodegen.cpp
index e52dd50..081b19c 100644
--- a/cpp/qrcodegen.cpp
+++ b/cpp/qrcodegen.cpp
@@ -39,6 +39,8 @@ using std::vector;
 
 namespace qrcodegen {
 
+/*---- Class QrSegment ----*/
+
 QrSegment::Mode::Mode(int mode, int cc0, int cc1, int cc2) :
 		modeBits(mode) {
 	numBitsCharCount[0] = cc0;
@@ -229,6 +231,8 @@ const char *QrSegment::ALPHANUMERIC_CHARSET = "0123456789ABCDEFGHIJKLMNOPQRSTUVW
 
 
 
+/*---- Class QrCode ----*/
+
 int QrCode::getFormatBits(Ecc ecl) {
 	switch (ecl) {
 		case Ecc::LOW     :  return 1;
@@ -820,6 +824,8 @@ data_too_long::data_too_long(const std::string &msg) :
 
 
 
+/*---- Class BitBuffer ----*/
+
 BitBuffer::BitBuffer()
 	: std::vector<bool>() {}