diff --git a/contents/elliptic-genera.tex b/contents/elliptic-genera.tex
index 57c9b3e33c5114bc21040bbec282a3ab51feba67..b764a3a8270c50dd5c5afd290048e78a0d4fd684 100644
--- a/contents/elliptic-genera.tex
+++ b/contents/elliptic-genera.tex
@@ -326,7 +326,7 @@ From a computational point of view, one could say, that we now plug the Chern cl
References: \cite[Ex.~III.11.11]{lawson_spin}
\end{example}
-The next player, that we need too, is the \Index{Chern character}:
+The next player, that we need to state the index theorem, is the \Index{Chern character}:
Let $E$ be a complex vector bundle of dimension $n$ over $X$.
We may write the total rational Chern class formally as\marginnote{$\deg x_i=2$}
\[
diff --git a/index_theory.tex b/index_theory.tex
index 889897121d84c0a4c1d674b466fbe67702ff4b23..34fe815e804022056f36e792f59565ce519a3496 100644
--- a/index_theory.tex
+++ b/index_theory.tex
@@ -5,7 +5,7 @@
\addbibresource{literature.bib}
\includeonly{% comment out as needed
- % contents/diffop,
+ contents/diffop,
% contents/K-homology,
contents/characteristic,
contents/elliptic-genera,