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+# How to generate documentation from source code using doxygen
+
+## Install doxygen
+
+If you want to use doxygen to generate documentation on Ubuntu, please install packages
+
+```
+$ sudo apt install doxygen
+```
+
+## Generate documentation
+
+### Pre-defined configuration
+
+You can find pre-defined configuration at `infra/doxygen/Doxyfile`
+
+### Option 1: Use pre-defined configuration
+
+You can use pre-defined configuration directly at nnas's root path
+
+```
+<nnas-root-path>$ doxygen infra/doxygen/Doxyfile
+```
+
+Generated documentation html is in `doxygen/html`
+
+### Option 2: Use nnas command (recommand)
+
+You can use nnas command `doxygen`
+
+```
+$ <nnas-root-path>/nnas doxygen
+```
+
+Generated documentation html is in your workspace directory: `<NNAS_WORKSPACE>/doxygen/html`
+Default workspace directory is `build`