diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index f5f86d79..b499a9ca 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,6 +1,10 @@
 # Changelog
 All changes to this project will be documented in this file.
 
+## [9.7.3] - 2020-06-11
+
+(redis cobra bots) capture most used devices in a zset
+
 ## [9.7.2] - 2020-06-11
 
 (ws) add bare bone redis-cli like sub-command, with command line editing powered by libnoise
diff --git a/ixbots/ixbots/IXCobraMetricsToRedisBot.cpp b/ixbots/ixbots/IXCobraMetricsToRedisBot.cpp
index 61fee3dd..ae5aa2bb 100644
--- a/ixbots/ixbots/IXCobraMetricsToRedisBot.cpp
+++ b/ixbots/ixbots/IXCobraMetricsToRedisBot.cpp
@@ -60,7 +60,7 @@ namespace ix
         std::string errMsg;
         if (redisClient.xadd(id, std::to_string(slowFrames), maxLen, errMsg).empty())
         {
-            CoreLogger::info(std::string("redis xadd error: ") + errMsg);
+            CoreLogger::info(std::string("redis XADD error: ") + errMsg);
         }
 
         //
@@ -77,7 +77,26 @@ namespace ix
         maxLen = 1000;
         if (redisClient.xadd(id, std::to_string(slowFrames), maxLen, errMsg).empty())
         {
-            CoreLogger::info(std::string("redis xadd error: ") + errMsg);
+            CoreLogger::info(std::string("redis XADD error: ") + errMsg);
+        }
+
+        //
+        // Add device to the device zset, and increment the score
+        // so that we know which devices are used more than others
+        // ZINCRBY myzset 1 one
+        //
+        ss.str(""); // reset the stringstream
+        ss << msg["id"].asString() << "_slow_frames_devices" << "."
+           << msg["device"]["game"].asString();
+
+        id = ss.str();
+        std::vector<std::string> args = {
+            "ZINCRBY", id, "1", deviceId
+        };
+        auto response = redisClient.send(args, errMsg);
+        if (response.first == RespType::Error)
+        {
+            CoreLogger::info(std::string("redis ZINCRBY error: ") + errMsg);
         }
 
         return true;
diff --git a/ixwebsocket/IXWebSocketVersion.h b/ixwebsocket/IXWebSocketVersion.h
index e24e49ed..5e6666d4 100644
--- a/ixwebsocket/IXWebSocketVersion.h
+++ b/ixwebsocket/IXWebSocketVersion.h
@@ -6,4 +6,4 @@
 
 #pragma once
 
-#define IX_WEBSOCKET_VERSION "9.7.2"
+#define IX_WEBSOCKET_VERSION "9.7.3"
diff --git a/makefile b/makefile
index 3ab52aac..0779b287 100644
--- a/makefile
+++ b/makefile
@@ -234,7 +234,7 @@ doc:
 	mkdocs gh-deploy
 
 change:
-	vi ixwebsocket/IXWebSocketVersion.h docs/CHANGELOG.md
+	vim ixwebsocket/IXWebSocketVersion.h docs/CHANGELOG.md
 
 .PHONY: test
 .PHONY: build