diff --git a/tp2.md b/tp2.md
index 9e926af..29a1718 100644
--- a/tp2.md
+++ b/tp2.md
@@ -183,3 +183,23 @@ Ajouter un histogramme pour le volume dans le réservoir
 - 8
 - 9
 - 9.5
+
+```
+#include <prometheus/histogram.h>
+
+
+ Histogram::BucketBoundaries buckets = {
+        2, 5, 6, 7, 8, 9, 9.5
+    };
+
+ auto& hist_family = BuildHistogram()
+        .Name("volume")
+        .Help("volume du reservoir en m3")
+        .Register(*registry);
+
+auto& request_volume = hist_family.Add({}, buckets);
+
+auto& request_duration_login =
+    hist_family.Add({{"endpoint", "/login"}}, buckets);
+
+request_duration_login.Observe(0.42);