diff --git a/chapter09.tex b/chapter09.tex
index 4a2fbf8..73d8795 100644
--- a/chapter09.tex
+++ b/chapter09.tex
@@ -759,9 +759,8 @@ memory and is a bit more difficult to implement.
 
 \subsubsection{Structure}
 
-A segment tree is a binary tree that
-contains $2n-1$ nodes.
-The nodes on the bottom level of the tree
+A segment tree is a binary tree
+such that the nodes on the bottom level of the tree
 correspond to the array elements,
 and the other nodes
 contain information needed for processing range queries.