diff --git a/README.md b/README.md
index 2e90a02..6a1a40e 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# A calculator for distributions, for Fermi estimation
+# A terminal calculator for distributions, for Fermi estimation
 
 This project is a minimalist, calculator-style DSL for fermi estimation. It can multiply, divide, add and subtract scalars, lognormals and beta distributions, and supports variables.
 
@@ -6,36 +6,21 @@ This project is a minimalist, calculator-style DSL for fermi estimation. It can
 
 Sometimes, [Squiggle](https://github.com/quantified-uncertainty/squiggle), [simple squiggle](https://git.nunosempere.com/quantified.uncertainty/simple-squiggle) or [squiggle.c](https://git.nunosempere.com/personal/squiggle.c) are still too complicated and un-unix-like. In particular, their startup cost is not instant. 
 
-## Installation
+## Build instructions 
+
+Install the [go toolchain](https://go.dev/dl/), then:
+
 
 ```
+git clone https://git.nunosempere.com/NunoSempere/fermi
 make build
+./fermi
 sudo make install
 fermi 
 ```
 
 ## Usage
 
-```
-$ fermi
-5000000 12000000
-=> 5.0M 12.0M
-* beta 1 200
-=> 1.9K 123.1K
-* 30 180
-=> 122.9K 11.7M
-/ 48 52
-=> 2.5K 234.6K
-/ 5 6
-=> 448.8 43.0K
-/ 6 8
-=> 64.5 6.2K
-/ 60
-=> 1.1 103.7
-```
-
-Perhaps this example is more understandable with comments and better units:
-
 ```
 $ fermi
 5M 12M           # number of people living in Chicago
@@ -48,10 +33,12 @@ beta 1 200       # fraction of people that have a piano
 =: piano_tuners
 ```
 
+Here are some real-life examples: [Chance for a Russian male of fighting age of being drafted](https://x.com/NunoSempere/status/1829525844169248912), [did the startup Friend burn too much cash](https://x.com/NunoSempere/status/1818810770932568308), [how much did Nikita Bier make mentoring?](https://x.com/NunoSempere/status/1815169781907042504), [what fraction of North Korea's caloric intake is Russia supporting?](https://x.com/NunoSempere/status/1855666428835140078). In general, as a terminal guy, I've found that having zero startup cost makes creating small fermi models much cheaper, and thus happen more often.
+
 If you type "help" (or run fermi -h), you can see a small grammar and some optional command flags:
 
 ```
-$ fermi
+$ fermi -h
 
 1. Grammar:
   Operation | Variable assignment | Special
@@ -88,6 +75,7 @@ $ fermi
     1 10
     + beta 1 100
     )
+    / 1% 
     =. y
     mx x 1 y 2.33
     + mx x 30% y 70%
@@ -104,12 +92,11 @@ $ fermi
 
 ```
 
-You can see real life examples [here](https://x.com/NunoSempere/status/1831106442721452312), [here](https://x.com/NunoSempere/status/1829525844169248912), [here](https://x.com/NunoSempere/status/1818810770932568308), [here](https://x.com/NunoSempere/status/1816605190415401100), [here](https://x.com/NunoSempere/status/1816604386703081894), [here](https://x.com/NunoSempere/status/1815169781907042504)
-
 ## Tips & tricks
 
 - It's conceptually clearer to have all the multiplications first and then all the divisions
 - For distributions between 0 and 1, consider using a beta distribution
+- The default operation is multiplication
 
 ### Command line options
 
diff --git a/makefile b/makefile
index 0e4ab0e..182a89b 100644
--- a/makefile
+++ b/makefile
@@ -2,7 +2,7 @@ build:
 	go build main/fermi.go main/pretty.go main/error.go
 
 run:
-	go run fermi.go
+	go run main/fermi.go main/error.go main/pretty.go
 
 install: fermi 
 	rm /usr/bin/fermi