Add units to metrics descriptions
diff --git a/src/couch_prometheus/src/couch_prometheus_server.erl b/src/couch_prometheus/src/couch_prometheus_server.erl
index 5e446a9..70c4790 100644
--- a/src/couch_prometheus/src/couch_prometheus_server.erl
+++ b/src/couch_prometheus/src/couch_prometheus_server.erl
@@ -134,7 +134,7 @@
         to_prom(
             erlang_memory_bytes,
             gauge,
-            "size of memory dynamically allocated by the Erlang emulator",
+            "size of memory (in bytes) dynamically allocated by the Erlang emulator",
             MemLabels
         ),
         to_prom(