diff --git a/algebra.tex b/algebra.tex
index a971ab105..3ed1730b7 100644
--- a/algebra.tex
+++ b/algebra.tex
@@ -2287,7 +2287,7 @@ \section{Tensor algebra}
 \end{slogan}
 Let $R$ be a ring. Let $M_i$ be a directed system of
 $R$-modules. Then
-$\colim_i \text{T}(M) = \text{T}(\colim_i M_i)$
+$\colim_i \text{T}(M_i) = \text{T}(\colim_i M_i)$
 and similarly for the symmetric and exterior algebras.
 \end{lemma}