diff --git a/Paper.tex b/Paper.tex
index 799f606f..58eaeaab 100644
--- a/Paper.tex
+++ b/Paper.tex
@@ -468,7 +468,7 @@ \subsubsection{Block Header Validity}
 \end{equation}
 \begin{equation*}
 x \equiv \begin{cases}
-1 & \text{if} \, \lVert B_\mathbf{U}\rVert = 0 \\
+1 & \text{if} \, \lVert P(H)_\mathbf{U}\rVert = 0 \\
 2 & \text{otherwise}
 \end{cases}
 \end{equation*}