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diff --git a/ucw/doc/compress.txt b/ucw/doc/compress.txt
index 7e950997..d4527636 100644
--- a/ucw/doc/compress.txt
+++ b/ucw/doc/compress.txt
@@ -3,10 +3,12 @@ Compression
 
 The library contains a compression routine, called LiZaRd.  It is
 modified Lempel-Ziv 77 method with slightly worse compression ratio,
-but with faster compression and decompression.
+but with faster compression and decompression (compression is few times
+faster than zlib, decompression is slightly slower than memcpy()).
 
-// TODO Meaning of the abbreviation
-// TODO Actual numbers how fast it is?
+The data format and inspiration for code comes from the LZO project
+(which couldn't be used due to licence problems). They might be
+compatible, but no-one tested that.
 
 - <<basic,Basic application>>
 - <<safe,Safe decompression>>