diff --git a/README.md b/README.md
index 55bac74..189e754 100644
--- a/README.md
+++ b/README.md
@@ -334,6 +334,8 @@ mappings:
 If a metric `my.statsd_counter` is received, the metric name will **still** be mapped to `my_statsd_counter` (Prometheus compatible name).
 But the metric will also have the label `statsd_metric_name` with the value `my.statsd_counter` (unchanged value).
 
+Note: If you use the `match` like the example (i.e. `.+`), be aware that it will be a "catch-all" block. So it should come at the very end of the mapping list.
+
 The same is not achievable with glob matching, for more details check [this issue](https://github.com/prometheus/statsd_exporter/issues/438).
 
 ### Naming, labels, and help