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     $ ruby ./minirake test
 
+## Building documentation
+
+There are two sets of documentation in mruby: the mruby API (generated by yard) and C API (Doxygen)
+
+To build both of them, simply go
+
+    rake doc
+
+You can also view them in your browser
+
+    rake view_api
+    rake view_capi
+
 ## How to customize mruby (mrbgems)
 
 mruby contains a package manager called *mrbgems*. To create extensions