diff --git a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/PercentilesAggregator.java b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/PercentilesAggregator.java
index cf6d670..e508ea8 100644
--- a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/PercentilesAggregator.java
+++ b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/PercentilesAggregator.java
@@ -55,6 +55,8 @@ public class PercentilesAggregator {
         }
 
         public void collect(final LongLongHashMap map) {
+            percentiles.put("0.000", 0L); // make sure "0.000" is the first element in the sorted percentiles. Will be
+                                          // overwritten with the correct value later
             map.forEachOrdered(this);
             percentiles.put("0.000", minValue);
             percentiles.put("100.000", maxValue);