diff --git a/luku04.tex b/luku04.tex
index 61103d1..0e133f7 100644
--- a/luku04.tex
+++ b/luku04.tex
@@ -337,7 +337,7 @@ Thus, the range defined by the iterators is \emph{half-open}.
 \subsubsection{Working with ranges}
 
 Iterators are used in C++ standard library functions
-that work with ranges of data structures.
+that are given a range of elements in a data structure.
 Usually, we want to process all elements in a
 data structure, so the iterators
 \texttt{begin} and \texttt{end} are given for the function.