Index: README.md
diff --git a/README.md b/README.md
index f1063cc7a69f87a2db239fb7e93848b0e2bd0a1b..4501d3289f10c1fd73cdc40ad995c758e60a5738 100644
--- a/README.md
+++ b/README.md
@@ -23,9 +23,14 @@ Building
 
 ### Supported target platforms and prerequisites
 
-You need a C++14 compatible compiler to build libadblockplus. Below there is
+General:
+* You need a C++14 compatible compiler to build libadblockplus. Below there is
 the list of tested tools.
 
+* 7z
+We use 7z for prebuilt V8. In order to install it on a debian-based system
+one can use `p7zip-full` package and `p7zip-plugins` on rpm-based.
+
 Win32:
 * At least v141 Visual C++ toolset (available in Microsoft Visual Studio 2017).