diff --git a/README.md b/README.md
index d402f62..1bfdc45 100644
--- a/README.md
+++ b/README.md
@@ -154,7 +154,7 @@
 
 `basisu x.png -comp_level 5 -max_endpoints 16128 -max_selectors 16128 -no_selector_rdo -no_endpoint_rdo`
 
-Level 5 is extremely slow, so unless you have a very powerful machine, levels 2-4 are recommended.
+Level 5 is extremely slow, so unless you have a very powerful machine, levels 1-4 are recommended.
 
 Note that "-no_selector_rdo -no_endpoint_rdo" are optional. Using them hurts rate distortion performance, but increases quality. An alternative is to use -selector_rdo_thresh X and -endpoint_rdo_thresh, with X ranging from [1,2] (higher=lower quality/better compression - see the tool's help text).
 
@@ -162,8 +162,8 @@
 
 `basisu -comp_level 2 -tex_type video -stats -debug -multifile_printf "pic%04u.png" -multifile_num 200 -multifile_first 1 -max_selectors 16128 -max_endpoints 16128 -endpoint_rdo_thresh 1.05 -selector_rdo_thresh 1.05`
 
-The reference encoder will take a LONG time and a lot of CPU to encode video. The more cores your machine has, the better. Basis is intended for smaller videos of a few dozen seconds or so. If you are very patient and have a Threadripper or Xeon workstation, you should be able to encode up to a few thousand 720P frames. The "webgl_videotest" directory contains a very simple video viewer.
-For texture video, use -comp_level 2 or 3. The default is 1, which isn't quite good enough for texture video.
+For video, the more cores your machine has, the better. Basis is intended for smaller videos of a few dozen seconds or so. If you are very patient and have a Threadripper or Xeon workstation, you should be able to encode up to a few thousand 720P frames. The "webgl_videotest" directory contains a very simple video viewer.
+For texture video, use -comp_level 2 or 3. The default is 1, which isn't quite good enough for texture video. Higher comp_level's result in reduced ETC1S artifacts.
 
 The .basis file will contain multiple images (all using the same global codebooks), which you can retrieve using the transcoder's image API. The system now supports [conditional replenisment](https://en.wikipedia.org/wiki/MPEG-1) (CR, or "skip blocks"). CR can reduce the bitrate of some videos (highly dependent on how dynamic the content is) by over 50%. For videos using CR, the images must be requested from the transcoder in sequence from first to last, and random access is only allowed to I-Frames.