diff --git a/book/src/chapter_3.md b/book/src/chapter_3.md
index 8b1e72f6..a6907286 100644
--- a/book/src/chapter_3.md
+++ b/book/src/chapter_3.md
@@ -10,7 +10,7 @@
 
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-The remainder of this tutorial will be dedicated to making a Roguelike. [Rogue](https://en.wikipedia.org/wiki/Rogue_(video_game) appeared in 1980, as a text-mode dungeon exploration game. It has spawned an entire genre of "roguelikes": procedurally generated maps, hunting an objective over multiple levels and "permadeath" (restart when you die). The definition is the source of many online fights; I'd rather avoid that!
+The remainder of this tutorial will be dedicated to making a Roguelike. [Rogue](https://en.wikipedia.org/wiki/Rogue_\(video_game\)) appeared in 1980, as a text-mode dungeon exploration game. It has spawned an entire genre of "roguelikes": procedurally generated maps, hunting an objective over multiple levels and "permadeath" (restart when you die). The definition is the source of many online fights; I'd rather avoid that!
 
 A Roguelike without a map to explore is a bit pointless, so in this chapter we'll put together a basic map, draw it, and let your player walk around a bit. We're starting with the code from chapter 2, but with the red smiley faces (and their leftward tendencies) removed.