diff --git a/src/harmonic/index.tex b/src/harmonic/index.tex
index bb76797..af820bf 100644
--- a/src/harmonic/index.tex
+++ b/src/harmonic/index.tex
@@ -3,4 +3,5 @@
 
 \input{./lcg/index.tex}
 \input{./rep/index.tex}
+\input{./commutative/index.tex}
 \input{./notation.tex}