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@@ -4,6 +4,27 @@ a **suckless** and **minimal**, **POSIX C99** alternative to `Makefile`/`justfil
 
 ---
 
+## install `rf`
+
+you can either install the AUR package `rf` with your favourite AUR helper
+
+or build rfile manually with `gcc` or any other POSIX C99 compiler
+
+---
+
+## extra compile options
+
+you can enable the following flags to enable extra feautures for `rf`:
+
+> using `gcc` you can do `gcc -D FLAG_NAME ...`
+
+- `RF_EXTRAS`: enables all `EXTRA_*` features
+- `RF_EXTRA_MORE_COMMENTS`: enables `//` and `--` comments for `rfile`s
+- `RF_HIDDEN_CMD`: hides the `$ cmd` for commands
+- `RF_MAX_VARS=num` : ovverrides the default number (512) of maximum variables
+
+---
+
 ## `rfile` syntax & features
 
 - `#` -> ignore line (comment)