diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 5ec3654307..577cd37167 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -1,6 +1,27 @@
 # Release notes #
 
-### Current dev branch ###
+### r2.x ###
+
+ExoPlayer 2.x is a major rewrite that's still under development. We suggest
+following our [Medium page](https://medium.com/google-exoplayer) to learn more,
+as we work toward writing more complete documentation and the first 2.x release.
+
+### r1.5.9 ###
+
+* MP4: Fixed incorrect sniffing in some cases (#1523).
+* MP4: Improved file compatibility (#1567).
+* ID3: Support for TIT2 and APIC frames.
+* Fixed querying of platform decoders on some devices.
+* Misc bug fixes.
+
+### r1.5.8 ###
+
+* HLS: Fix handling of HTTP redirects.
+* Audio: Minor adjustment to improve A/V sync.
+* OGG: Support FLAC in OGG.
+* TTML: Support regions.
+* WAV/PCM: Support 8, 24 and 32-bit WAV and PCM audio.
+* Misc bug fixes and performance optimizations.
 
 ### r1.5.7 ###