diff --git a/content/3.defense-systems/pd-t4-8.md b/content/3.defense-systems/pd-t4-8.md
index 34bb434246c15d366b5a61719c826510a7e79c39..cbfc5762fbc50de6e93a766d73086d315fb88968 100644
--- a/content/3.defense-systems/pd-t4-8.md
+++ b/content/3.defense-systems/pd-t4-8.md
@@ -19,7 +19,7 @@ relevantAbstracts:
 # PD-T4-8
 
 ## Description
-PD-T4-8 is composed of a single protein that contains a DUF4263 domain found in the Shedu defence system :ref{doi=10.1038/s41564-022-01219-4}. PD-T4-8 from *Escherichia coli* RCP52534.1 confers resistance against T2, T4, T6, SECphi18 and SECphi27.
+PD-T4-8 is composed of a single protein that contains a DUF4263 domain found in the [Shedu](/defense-systems/shedu) defence system :ref{doi=10.1038/s41564-022-01219-4}. PD-T4-8 from *Escherichia coli* RCP52534.1 confers resistance against T2, T4, T6, SECphi18 and SECphi27.
 
 ## Molecular mechanisms
 As far as we are aware, the molecular mechanism is unknown.