diff --git a/.gitignore b/.gitignore
index bb78c1f..6ad20f1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 go-sh-manymanuals
+/datasheets/
diff --git a/README.md b/README.md
index 7651e98..7d6df41 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,10 @@ manuals and datasheets for everything in [Varia](https://varia.zone).
 
 ## Hacking
 
-`go run go-sh-manymanuals.go`
+```
+mkdir -p datasheets # fill with https://vvvvvvaria.org/~crunk/datasheets.zip
+go run go-sh-manymanuals.go
+```
 
 ## Road Map, Get it going, Change while we learn