diff --git a/README.md b/README.md
index d2bf536..543a068 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ as described in [RFC4648, par. 5]. To allow for truncate-resistant upgrading
 of the URL key format, the first bit is set to `0`. That means the first base64
 character will always be in `[A-Za-f]`.
 
-This domain contains 8388608 values. If the service is somewhat used, we will
+This domain contains `8388608` values. If the service is somewhat used, we will
 get collisions early when we generate those keys at random. Instead, we will
 use format-preserving-encryption to construct a counter that visits every value
 in an unpredictable order. Daan will fix this.