Updated runtime files
diff --git a/runtime/doc/if_lua.txt b/runtime/doc/if_lua.txt
index f9039ea..0064f0b 100644
--- a/runtime/doc/if_lua.txt
+++ b/runtime/doc/if_lua.txt
@@ -59,6 +59,12 @@
 	EOF
 	endfunction
 <
+To see what version of Lua you have: >
+	:lua print(_VERSION)
+
+If you use LuaJIT you can also use this: >
+	:lua print(jit.version)
+<
 
 							*:luado*
 :[range]luado {body}	Execute Lua function "function (line, linenr) {body}