diff --git a/book/source/02-highlevel.md b/book/source/02-highlevel.md
index 6f849cd..c020df0 100644
--- a/book/source/02-highlevel.md
+++ b/book/source/02-highlevel.md
@@ -22,7 +22,7 @@ The OpenPGP standard has evolved over time, and remains under active development
 
 ### "Pretty Good Privacy (PGP)"
 
-The earliest roots of OpenPGP trace back to *"Pretty Good Privacy (PGP)"*, a software program written by [Phil Zimmermann](https://en.wikipedia.org/wiki/Phil_Zimmermann) and first released in 1991.
+The origins of OpenPGP can be traced back to *Pretty Good Privacy (PGP)*, a software program written by [Phil Zimmermann](https://en.wikipedia.org/wiki/Phil_Zimmermann) and first released in 1991.
 
 The original PGP software has played a role in the political struggles sometimes referred to as the ["Crypto Wars"](https://en.wikipedia.org/wiki/Crypto_Wars) (also see ["Crypto: How the Code Rebels Beat the Government Saving Privacy in the Digital" (2002)](https://en.wikipedia.org/wiki/Crypto_(book)) for some of that history, including part of the history of PGP).