diff --git a/README.adoc b/README.adoc
index 6636f3c..066e312 100644
--- a/README.adoc
+++ b/README.adoc
@@ -13,7 +13,8 @@ It uses link:https://github.com/fdehau/tui-rs[tui-rs] for the UI and link:https:
 
 === Comparison with existing tools
 
-* Orpie: has more features at the moment. Matrices, units, more default constants
+* `orpie` (`ocaml`): has more features at the moment. Matrices, units, more default constants, etc, but I don't think it allows for custom macros
+* `dc` (`c`): allows for different input/output radix, no TUI and does not show the stack
 
 == Setup
 
@@ -28,6 +29,18 @@ cargo install --git [this url]
 rpn_rs
 ----
 
+=== Development setup
+
+[source,sh,title='bash']
+----
+git clone [this url]
+cargo build
+
+# For docs
+gem install --user-install rouge
+asciidoctor REAMDE.adoc
+----
+
 == Usage
 
 * `h`: Help menu - shows all keys
@@ -41,6 +54,58 @@ rpn_rs
 * `r`: Recall next char's register
 * `e`: When entering a number, applies `* 10^`
 
+=== Custom constants and macros
+
+If you have not done this before, open the calculator and press `<ctrl+s>` to save the basic config.
+
+Edit the config file (in Linux, edit `~/.config/rpn_rs/rpn_rs.toml` and add any constants or macros and press `<ctrl+l>` or reopen the calculator.
+
+Sample Macros:
+
+[toml, title='~/.config/rpn_rs/rpn_rs.toml']
+----
+# Push a, then b, then c, then mQ
+[macros.Q]
+macro = 'CalculatorMacro'
+help = 'Quadratic Formula'
+value = 'RcRbRarbnrb2^4rarc**-v+2ra*/rbnrb2^4rarc**-v-2ra*/'
+----
+
+Sample Constants (you can copy paste the ones you want into your config file):
+
+[toml, title='~/.config/rpn_rs/rpn_rs.toml']
+----
+[constants.E]
+macro = 'CalculatorConstant'
+help = 'Earth Mass (kg)'
+value = 5.972e24
+
+[constants.S]
+macro = 'CalculatorConstant'
+help = 'Sun Mass (kg)'
+value = 1.989e30
+
+[constants.a]
+macro = 'CalculatorConstant'
+help = '''Avogadro's Number (mol^-1)'''
+value = 6.022e23
+
+[constants.G]
+macro = 'CalculatorConstant'
+help = 'Gravitational Constant (Nm^2kg^-2)'
+value = 6.67e-11
+
+[constants.c]
+macro = 'CalculatorConstant'
+help = 'Speed of light (m/s)'
+value = 2.9979e8
+
+[constants.h]
+macro = 'CalculatorConstant'
+help = 'Planck constant (Js)'
+value = 6.626e-34
+----
+
 == Lore
 
 === Why?