Update readme

ioi · Oct 8, 2017 · 80a80bf · 80a80bf
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@@ -24,3 +24,5 @@ is available online.
 
 To compile Isolate, you need the headers for the libcap library
 (usually available in a libcap-dev package).
+
+You may need `a2x` ( found in [AsciiDoc](http://www.methods.co.nz/asciidoc/a2x.1.html) ) for building manual. But if you only want the isolate binary, you can just run `make isolate`