diff --git a/webrtc_videos/README b/webrtc_videos/README
new file mode 100644
index 0000000..c1e06b3
--- /dev/null
+++ b/webrtc_videos/README
@@ -0,0 +1,4 @@
+The reference files of the various resolutions must be frame-by-frame
+exact copies of each other - otherwise the WebRTC video quality test
+will produce incorrect results. The only addition must be the extra
+frame padding around the .y4m files.
diff --git a/webrtc_videos/reference_video_1280x720_30fps.yuv.sha1 b/webrtc_videos/reference_video_1280x720_30fps.yuv.sha1
new file mode 100644
index 0000000..2a51254
--- /dev/null
+++ b/webrtc_videos/reference_video_1280x720_30fps.yuv.sha1
@@ -0,0 +1 @@
+54fc4422bed2fd3f8215b4bbc55151378650a4d6
\ No newline at end of file
diff --git a/webrtc_videos/reference_video_640x360_30fps.yuv.sha1 b/webrtc_videos/reference_video_640x360_30fps.yuv.sha1
new file mode 100644
index 0000000..ef6c186
--- /dev/null
+++ b/webrtc_videos/reference_video_640x360_30fps.yuv.sha1
@@ -0,0 +1 @@
+da08662aadb5a86ee6c95fca4a1a59ddc0b7a733
\ No newline at end of file