diff --git a/docs/2_Theoretical_background/DNA-based-monitoring-indicator.md b/docs/2_Theoretical_background/DNA-based-monitoring-indicator.md
index c5b1466..d03bbc4 100644
--- a/docs/2_Theoretical_background/DNA-based-monitoring-indicator.md
+++ b/docs/2_Theoretical_background/DNA-based-monitoring-indicator.md
@@ -22,3 +22,7 @@ This indicator was not adopted by the GBF, but several countries have started to
 {: .important }
 The DNA-based monitoring indicator is measured at the species level, e.g. each species being monitored counts as one, even if only one of their population is being monitored.
 
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+[Previous: PM indicator](https://aliciamstt.github.io/guidelines-genetic-diversity-indicators/docs/2_Theoretical_background/PM-indicator.html#populations-maintained-indicator){: .btn .btn-blue .mr-4 }
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