diff --git a/report.org b/report.org
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+++ b/report.org
@@ -109,6 +109,8 @@ Duplicate genes may be conserved and gain a new function.
 For instance, in /Drosophila/, the set of olfactory receptor genes result from several duplication and deletion events [cite:@nozawaEvolutionaryDynamicsOlfactory2007], after which the duplicate may specialize in the detection of a particular chemical compound.
 *** Subfunctionalisation
 Two duplicate genes with the same original function may encounter a subfunctionalisation during which each gene conserves only one part of the function.
+*** Functional redundancy
+Two copies may keep the ancestral function: in this case the organism may increase the quantity of gene product.
 
 ** Methods to identify duplicate genes
 [[latex:textsc][Lallemand]] et al. review the different methods used to detect duplicate genes. These methods depend on the type of duplicate genes they target, and vary on computation burden [cite:@lallemandOverviewDuplicatedGene2020].
diff --git a/report.pdf b/report.pdf
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@@ -1,3 +1,3 @@
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