diff --git a/chapter19.tex b/chapter19.tex
index 684ea08..ae12b18 100644
--- a/chapter19.tex
+++ b/chapter19.tex
@@ -502,7 +502,7 @@ \subsubsection{Existence}
 that they guarantee the existence of a Hamiltonian path
 if the graph has \emph{a large number} of edges.
 This makes sense, because the more edges the graph contains,
-the more possibilities there is to construct a Hamiltonian path.
+the more possibilities there are to construct a Hamiltonian path.
 
 \subsubsection{Construction}