diff --git a/fastiv-io.c b/fastiv-io.c
index 33ff9b8..330e716 100644
--- a/fastiv-io.c
+++ b/fastiv-io.c
@@ -1896,6 +1896,7 @@ fastiv_io_open_from_data(const char *data, size_t len, const gchar *path,
 		}
 #endif  // HAVE_XCURSOR --------------------------------------------------------
 #ifdef HAVE_LIBWEBP  //---------------------------------------------------------
+		// TODO(p): https://github.com/google/wuffs/commit/4c04ac1
 		if ((surface = open_libwebp(data, len, path, error)))
 			break;
 		if (error) {
diff --git a/tools/webpinfo.c b/tools/webpinfo.c
index a138985..f3417f9 100644
--- a/tools/webpinfo.c
+++ b/tools/webpinfo.c
@@ -28,6 +28,10 @@
 // https://github.com/webmproject/libwebp/blob/master/doc/webp-container-spec.txt
 // https://github.com/webmproject/libwebp/blob/master/doc/webp-lossless-bitstream-spec.txt
 // https://datatracker.ietf.org/doc/html/rfc6386
+//
+// Pretty versions, hopefully not outdated:
+// https://developers.google.com/speed/webp/docs/riff_container
+// https://developers.google.com/speed/webp/docs/webp_lossless_bitstream_specification
 
 static jv
 parse_webp(jv o, const uint8_t *p, size_t len)