diff --git a/cmds/statsd/src/atoms.proto b/cmds/statsd/src/atoms.proto
index b79406cd5735a..650545f939ccc 100644
--- a/cmds/statsd/src/atoms.proto
+++ b/cmds/statsd/src/atoms.proto
@@ -9111,6 +9111,9 @@ message VoiceCallSession {
 
     // Whether the call was performed while roaming.
     optional bool is_roaming = 24;
+
+    // A random number used as the dimension field to pull multiple atoms.
+    optional int32 dimension = 25;
 }
 
 /**