diff --git a/components/content/ArticleSystemDistributionPlot.vue b/components/content/ArticleSystemDistributionPlot.vue
index 1d872d627469b5582c995b645d834872d2daf03f..e214cb2fe1452ac68b40457f12d2726b0d72e225 100644
--- a/components/content/ArticleSystemDistributionPlot.vue
+++ b/components/content/ArticleSystemDistributionPlot.vue
@@ -104,7 +104,7 @@ const distributionOptions = computed(() => {
         ...toValue(margin),
         y: { label: `% of genomes encoding ${toValue(page)?.title ?? 'the system'}` },
         x: { label: selectedTaxoRank.value, tickRotate: 45 },
-        color: { scheme: "plasma", legend: true, domain: [0, 100], marginLeft: 10 },
+        color: { scheme: "plasma", legend: true, domain: [0, 100], marginLeft: 10, label: "percentage" },
         width: computedWidth.value - marginRight - marginLeft,
         marks: [
             Plot.barY(