add link

diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@ nihav-tool is a simple tool to test decoding functionality of NihAV.
 
 Put it into directory with other NihAV crates and invoke `cargo build`.
 
+See https://codecs.multimedia.cx/2020/07/some-words-about-nihav-tools/ for a description of how to use it.
+
 ## Contributing
 
 You're not supposed to. Even I hardly do that so why should you?