diff --git a/tex/waves/lectures/lec_7.tex b/tex/waves/lectures/lec_7.tex
new file mode 100644
index 0000000..a750ec6
--- /dev/null
+++ b/tex/waves/lectures/lec_7.tex
@@ -0,0 +1 @@
+\lecture{7}{18 marzo 2024}
\ No newline at end of file
diff --git a/tex/waves/waves.tex b/tex/waves/waves.tex
index 2f72c5e..f6f0f56 100644
--- a/tex/waves/waves.tex
+++ b/tex/waves/waves.tex
@@ -49,6 +49,6 @@
 
 \newpage
 
-\lec{3}{6}
+\lec{3}{7}
 
 \end{document}
\ No newline at end of file