diff --git a/platformio.ini b/platformio.ini
index f949eb7..cd07950 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -39,6 +39,8 @@ extra_scripts =
 	post:post.py
 lib_ldf_mode = chain+	
 monitor_speed = 115200
+build_flags = 
+	-D PIO_ENV_BUILD=$PIOENV
 
 [env:m5stack-atom]
 board = m5stack-atom
diff --git a/src/main.cpp b/src/main.cpp
index f66d556..d35bb77 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -87,7 +87,11 @@ const unsigned long HEAP_REPORT_TIME=2000; //set to 0 to disable heap reporting
 #define MAX_NMEA2000_MESSAGE_SEASMART_SIZE 500
 #define MAX_NMEA0183_MESSAGE_SIZE 150 // For AIS
 
+#ifndef FIRMWARE_TYPE
+#define FIRMWARE_TYPE PIO_ENV_BUILD
+#endif
 
+String firmwareType(GWSTRINGIFY(FIRMWARE_TYPE));
 
 typedef std::map<String,String> StringMap;
 
@@ -474,6 +478,7 @@ protected:
     char buffer[bsize];
     toHex(base,buffer,bsize);
     status["salt"] = buffer;
+    status["fwtype"]= firmwareType;
     //nmea0183Converter->toJson(status);
     countNMEA2KIn.toJson(status);
     countNMEA2KOut.toJson(status);
diff --git a/web/index.html b/web/index.html
index a9bad2c..571dde1 100644
--- a/web/index.html
+++ b/web/index.html
@@ -76,6 +76,10 @@
 
 </div>
 <div class="tabPage hidden" id="updatePage">
+  <div class="row">
+    <span class="label">firmware type</span>
+    <span class="value status-fwtype">---</span>
+  </div>
   <div class="row">
     <span class="label">currentVersion</span>
     <span class="value status-version">---</span>