diff --git a/README.md b/README.md
index 101cb77..a3b819a 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@
 
 ## Events
 
-### `MeasurementsAdded(string cid, uint roundIndex)`
+### `MeasurementsAdded(string cid, uint roundIndex, address sender)`
 ### `RoundStart(uint roundIndex)`
 ### `Transfer(address indexed to, uint256 amount)`
 ### `TransferFailed(address indexed to, uint256 amount)`
diff --git a/src/ImpactEvaluator.sol b/src/ImpactEvaluator.sol
index 221b886..3ef27b3 100644
--- a/src/ImpactEvaluator.sol
+++ b/src/ImpactEvaluator.sol
@@ -18,7 +18,7 @@ contract ImpactEvaluator is AccessControl {
     uint public roundReward = 100;
     uint public maxStoredRounds = 1000;
 
-    event MeasurementsAdded(string cid, uint roundIndex);
+    event MeasurementsAdded(string cid, uint roundIndex, address sender);
     event RoundStart(uint roundIndex);
     event Transfer(address indexed to, uint256 amount);
     event TransferFailed(address indexed to, uint256 amount);
@@ -80,7 +80,7 @@ contract ImpactEvaluator is AccessControl {
         maybeAdvanceRound();
         uint roundIndex = currentRoundIndex();
         rounds[roundIndex].measurementsCids.push(cid);
-        emit MeasurementsAdded(cid, roundIndex);
+        emit MeasurementsAdded(cid, roundIndex, msg.sender);
         return roundIndex;
     }
 
diff --git a/test/ImpactEvaluator.t.sol b/test/ImpactEvaluator.t.sol
index 32cad0a..cc88023 100644
--- a/test/ImpactEvaluator.t.sol
+++ b/test/ImpactEvaluator.t.sol
@@ -6,7 +6,7 @@ import "../src/ImpactEvaluator.sol";
 
 contract ImpactEvaluatorTest is Test {
     event RoundStart(uint roundIndex);
-    event MeasurementsAdded(string cid, uint roundIndex);
+    event MeasurementsAdded(string cid, uint roundIndex, address sender);
     event Transfer(address indexed to, uint256 amount);
 
     function test_AdvanceRound() public {
@@ -63,7 +63,7 @@ contract ImpactEvaluatorTest is Test {
         ImpactEvaluator impactEvaluator = new ImpactEvaluator(address(0x1));
         assertEq(impactEvaluator.getRoundMeasurementsCids(0).length, 0);
         vm.expectEmit(false, false, false, true);
-        emit MeasurementsAdded("cid", 0);
+        emit MeasurementsAdded("cid", 0, address(this));
         uint roundIndex = impactEvaluator.addMeasurements("cid");
         assertEq(roundIndex, 0);
         assertEq(impactEvaluator.getRoundMeasurementsCids(0).length, 1);