diff --git a/contracts/ownership/Claimable.sol b/contracts/ownership/Claimable.sol
index 59c2158a2..ae8080270 100644
--- a/contracts/ownership/Claimable.sol
+++ b/contracts/ownership/Claimable.sol
@@ -34,5 +34,6 @@ contract Claimable is Ownable {
   function claimOwnership() onlyPendingOwner {
     owner = pendingOwner;
     pendingOwner = 0x0;
+    OwnershipTransferred(owner);
   }
 }
diff --git a/contracts/ownership/DelayedClaimable.sol b/contracts/ownership/DelayedClaimable.sol
index f83ed5046..ddffd0d0e 100644
--- a/contracts/ownership/DelayedClaimable.sol
+++ b/contracts/ownership/DelayedClaimable.sol
@@ -36,6 +36,7 @@ contract DelayedClaimable is Claimable {
     owner = pendingOwner;
     pendingOwner = 0x0;
     end = 0;
+    OwnershipTransferred(owner);
   }
 
 }
diff --git a/contracts/ownership/Ownable.sol b/contracts/ownership/Ownable.sol
index fcb3ef91f..666747362 100644
--- a/contracts/ownership/Ownable.sol
+++ b/contracts/ownership/Ownable.sol
@@ -10,6 +10,9 @@ contract Ownable {
   address public owner;
 
 
+  event OwnershipTransferred(address indexed newOwner);
+
+
   /**
    * @dev The Ownable constructor sets the original `owner` of the contract to the sender
    * account.
@@ -35,6 +38,7 @@ contract Ownable {
   function transferOwnership(address newOwner) onlyOwner {
     require(newOwner != address(0));      
     owner = newOwner;
+    OwnershipTransferred(newOwner);
   }
 
 }