Update README.md
diff --git a/README.md b/README.md
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@@ -152,7 +152,7 @@
For best quality, you must supply basisu with original uncompressed source images. Any other type of lossy compression applied before basisu (including ETC1/BC1-5, BC7, JPEG, etc.) will cause multi-generational artifacts to appear in the final output textures.
-For the maximum possible achievable quality with the current format and encoder (completely ignoring encoding speed!), use:
+For the maximum possible achievable ETC1S mode quality with the current format and encoder (completely ignoring encoding speed!), use:
`basisu x.png -comp_level 5 -max_endpoints 16128 -max_selectors 16128 -no_selector_rdo -no_endpoint_rdo`
@@ -189,7 +189,10 @@
### More detailed examples
`basisu x.png`\
-Compress sRGB image x.png to x.basis using default settings (multiple filenames OK)
+Compress sRGB image x.png to a ETC1S format x.basis file using default settings (multiple filenames OK). ETC1S format files are typically very small on disk (around .5-1.5 bits/texel).
+
+`basisu -uastc x.png`\
+Compress image x.png to a UASTC format x.basis file using default settings (multiple filenames OK). UASTC files are the same size as BC7 on disk (8-bpp). Be sure to compress UASTC .basis files yourself using Deflate, zstd, etc. To increase .basis file compressibility (trading off quality for smaller compressed files) use the "-uastc_rdo_q X" command line parameter.
`basisu -q 255 x.png`\
Compress sRGB image x.png to x.basis at max quality level achievable without manually setting the codebook sizes (multiple filenames OK)
@@ -240,7 +243,7 @@
### Encoder speed
-Total time for basisu.exe to compress a 1024x1024 texture on a 7 year old 4-core 2.2GHz Core i7 laptop - timings are "without mipmaps/with mipmaps":
+Total time for basisu.exe to compress a 1024x1024 ETC1S texture on a 7 year old 4-core 2.2GHz Core i7 laptop - timings are "without mipmaps/with mipmaps":
* -comp_level 0:
