Improve knowledge base

1 files changed, 1 insertions, 1 deletions

diff --git a/source/know/concept/matsubara-sum/index.md b/source/know/concept/matsubara-sum/index.md
index 8b903d4..aef8379 100644
--- a/source/know/concept/matsubara-sum/index.md
+++ b/source/know/concept/matsubara-sum/index.md
@@ -36,7 +36,7 @@ $$\begin{aligned}
     = \sum_{z_p} e^{z_p \tau} \: \underset{z \to z_p}{\mathrm{Res}}\big( g(z) h(z) \big)
 \end{aligned}$$
 
-Where we have applied the residue theorem
+Where we have applied the [residue theorem](/know/concept/residue-theorem/)
 to get a sum over all simple poles $$z_p$$
 of either $$g$$ or $$h$$ (but not both) enclosed by $$C$$.
 Clearly, we could make this look like a Matsubara sum,