diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index 927248f2e3464eb74c97ce81b6ef15868b2048de..7dc5c283d48c91aa76f276e96bca21ab6fd6c30e 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -521,6 +521,9 @@ static int decode_frame(AVCodecContext *avctx,
                            s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
                     avctx->pix_fmt = AV_PIX_FMT_YA16BE;
                 } else {
+                    avpriv_report_missing_feature(avctx,
+                                                  "Bit depth %d color type %d",
+                                                  s->bit_depth, s->color_type);
                     goto fail;
                 }