explain the name

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diff --git a/README.md b/README.md
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@@ -5,6 +5,10 @@ Sliderule is the toolkit for working with the small web in Go.
 
 Think of it as a net/http for small web protocols. You still have to write your server, but you can focus on the logic you want to implement knowing the protocol is already dealt with. It's been said of gemini that you can write your server in a day. Now you can write it in well under an hour.
 
+## The slide rule
+
+Sliderule is named after the iconic instrument used to perform approximate mathematical calculations before the advent of handheld electronic calculators. It was the predominant tool that identified an engineer during project Gemini, a sort of developer's tool of it's time.
+
 ## The "sliderule" package
 
 Sliderule is carefully structured as composable building blocks. The top-level package defines the framework in which servers and clients can be built.