diff --git a/content/2.general-concepts/0.index.md b/content/2.general-concepts/0.index.md
index d8f88168c00b82d6987e3c94930238fc273177f5..8b2f6e591b431da6df1de072dbc462887fd6160d 100644
--- a/content/2.general-concepts/0.index.md
+++ b/content/2.general-concepts/0.index.md
@@ -10,10 +10,10 @@ In the following pages are presented different general concepts that are useful
 You'll find information on :
 
 1. [Abortive infection](/general-concepts/abortive-infection)
-2. [Defense Islands](/general-concepts/defense-islands)
-3. [Triggers of defense systems](/general-concepts/defense-systems_trigger)
-4. [Effectors of defense systems](/general-concepts/defense-systems_effector)
-5. [How defense systems were and are discovered](/general-concepts/defense-systems-discovery)
+2. [Triggers of defense systems](/general-concepts/defense-systems_trigger)
+3. [Effectors of defense systems](/general-concepts/defense-systems-effectors)
+4. [How defense systems were and are discovered](/general-concepts/defense-systems-discovery)
+5. [Defense Islands](/general-concepts/defense-islands)
 6. [Defensive domains](/general-concepts/defensive-domains)
 7. [MGE and defense systems](/general-concepts/mge-defense-systems)
 8. [Anti defense systems](/general-concepts/anti-defense-systems)
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