diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..fc241b5
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,11 @@
+# Change Log
+
+## Version 1.2.x
+
+### 1.2.1.0 (2023-Oct-06)
+- Fixed AnalogInput to output valid value for Proprietary Property 512 + 4 by editing database.json [Issue/5](https://github.com/chipkin/BACnetServerExampleNodeJS/issues/5)
+- Tested using BACnet Stack version 4.1.19.2330
+
+### 1.2.0.0 (N/A)
+
+- Inital release.
\ No newline at end of file
diff --git a/database.json b/database.json
index 03e0bdb..ac51ae3 100644
--- a/database.json
+++ b/database.json
@@ -17,10 +17,10 @@
             "description": "AnalogInput Bronze description",
             "units": "degreescelsius",
 
-            "proprietary_year": 0,
-            "proprietary_month": 0,
-            "proprietary_day": 0,
-            "proprietary_weekDay": 0,
+            "proprietary_year": 123,
+            "proprietary_month": 10,
+            "proprietary_day": 6,
+            "proprietary_weekday": 5,
             "proprietary_hour": 0,
             "proprietary_minute": 0,
             "proprietary_second": 0,
diff --git a/program.js b/program.js
index 34ff20c..c4b4ed5 100644
--- a/program.js
+++ b/program.js
@@ -33,7 +33,7 @@ const SETTING_IP_ADDRESS = []; // Set IP Address to use for BACnet, set to [] to
 const SETTING_SUBNET_MASK = []; // Set Subnet Mask to use for BACnet, set to [] to discover
 
 // Constants
-const APPLICATION_VERSION = '1.2.0.0';
+const APPLICATION_VERSION = '1.2.1.0';
 
 // Globals
 var fifoSendBuffer = new dequeue();