diff --git a/README.md b/README.md
index 96794e2..0ed1f38 100644
--- a/README.md
+++ b/README.md
@@ -3,4 +3,15 @@ LibXISF
 
 LibXISF is C++ library that can read and write XISF files produced by [PixInsight](https://pixinsight.com/).
 It implement [XISF 1.0 specification](https://pixinsight.com/doc/docs/XISF-1.0-spec/XISF-1.0-spec.html).
-It is licensed under GPLv3. To compile you will need C++17 compiler.
+It is licensed under GPLv3 or later. To compile you will need C++17 compiler.
+
+To compile simply run these commands
+```
+cmake -B build -S .
+cmake --build build --parallel
+cmake --install .
+```
+
+By default it use bundled libraries. If you wish to use external libraries you will may add
+ `-DUSE_BUNDLED_LIBS=Off` to first command. Then you will need *lz4 pkg-config pugixml zlib* installed.
+You may also specify `-DBUILD_SHARED_LIBS=Off` if you want build static lib.