diff --git a/docs/ghost-state.tex b/docs/ghost-state.tex
index 402a67310a77fed4e22cc730ee612edd106ddf0e..154a6bf58cc4313e6c1f2095619150716116dbc3 100644
--- a/docs/ghost-state.tex
+++ b/docs/ghost-state.tex
@@ -52,7 +52,7 @@ Persistence is preserved by conjunction, disjunction, separating conjunction as
 
 
 
-\subsection{Timeless Proposition and Except-0}
+\subsection{Timeless Propositions and Except-0}
 
 One of the troubles of working in a step-indexed logic is the ``later'' modality $\later$.
 It turns out that we can somewhat mitigate this trouble by working below the following \emph{except-0} modality: