diff --git a/source/13-correcting-quantum-channels.Rmd b/source/13-correcting-quantum-channels.Rmd
index 811a95f9..9f199d0d 100644
--- a/source/13-correcting-quantum-channels.Rmd
+++ b/source/13-correcting-quantum-channels.Rmd
@@ -294,10 +294,6 @@ iii. there exists a set of orthogonal isometries $\{V_i\}$ and a probability dis
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Consider the following interaction between a qubit and its environment:
$$
\begin{aligned}
@@ -643,6 +639,10 @@ If a quantum error correction method corrects errors $E_1$ and $E_2$, then it al
## Towards error correction {#towards-error-correction}
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