diff --git a/README.md b/README.md
index ba49a10..aade943 100644
--- a/README.md
+++ b/README.md
@@ -3,4 +3,7 @@ LuaSec 0.8
 LuaSec depends  on OpenSSL, and  integrates with LuaSocket to  make it
 easy to add secure connections to any Lua applications or scripts.
 
+Important: This version requires at least OpenSSL 1.0.2.
+           For old versions of OpenSSL, use LuaSec 0.7.
+
 Documentation: https://github.com/brunoos/luasec/wiki