diff --git a/libavformat/oggenc.c b/libavformat/oggenc.c
index efd57e4060..afed87f8b0 100644
--- a/libavformat/oggenc.c
+++ b/libavformat/oggenc.c
@@ -90,8 +90,11 @@ static int ogg_build_flac_headers(AVCodecContext *avctx,
     enum FLACExtradataFormat format;
     uint8_t *streaminfo;
     uint8_t *p;
+
     if (!ff_flac_is_extradata_valid(avctx, &format, &streaminfo))
         return -1;
+
+    // first packet: STREAMINFO
     oggstream->header_len[0] = 51;
     oggstream->header[0] = av_mallocz(51); // per ogg flac specs
     p = oggstream->header[0];
@@ -106,6 +109,8 @@ static int ogg_build_flac_headers(AVCodecContext *avctx,
     bytestream_put_byte(&p, 0x00); // streaminfo
     bytestream_put_be24(&p, 34);
     bytestream_put_buffer(&p, streaminfo, FLAC_STREAMINFO_SIZE);
+
+    // second packet: VorbisComment
     oggstream->header_len[1] = 1+3+4+strlen(vendor)+4;
     oggstream->header[1] = av_mallocz(oggstream->header_len[1]);
     p = oggstream->header[1];
@@ -116,6 +121,7 @@ static int ogg_build_flac_headers(AVCodecContext *avctx,
     bytestream_put_le32(&p, strlen(vendor));
     bytestream_put_buffer(&p, vendor, strlen(vendor));
     bytestream_put_le32(&p, 0); // user comment list length
+
     return 0;
 }