diff --git a/06-hash/hash.tex b/06-hash/hash.tex
index 55675d66ef9672d115108c81f63649f57cecab97..5c2ecdab338720466967f4831dd0ff86d0f1261e 100644
--- a/06-hash/hash.tex
+++ b/06-hash/hash.tex
@@ -134,7 +134,7 @@ ${\cal L} = \{ h_{a,b} \mid a,b\in [p] \}$ from $[p]$ to $[m]$, where
 $h_{a,b}(x) = ((ax+b) \bmod p) \bmod m$.
 }
 
-\theorem{The family~$\cal L$ is 1-universal.}
+\theorem{The family~$\cal L$ is 2-universal.}
 
 \proof
 Let $x,y$ be two distinct numbers in $[p]$.