diff --git a/README.md b/README.md
index 976f688..4146d65 100644
--- a/README.md
+++ b/README.md
@@ -121,6 +121,7 @@ milliseconds. If `options` is an array, a copy of that array is returned.
 * `minTimeout`: The number of milliseconds before starting the first retry. Default is `1000`.
 * `maxTimeout`: The maximum number of milliseconds between two retries. Default is `Infinity`.
 * `randomize`: Randomizes the timeouts by multiplying with a factor between `1` to `2`. Default is `false`.
+* `forever`: Whether the timeouts are for an operation that retries forever. If so and `retries` is `0`, one timeout is still returned, so there is a delay to repeat. Default is `false`.
 
 The formula used to calculate the individual timeouts is:
 
@@ -186,7 +187,7 @@ Available options:
 
 If `forever` is true, the following changes happen:
 * `RetryOperation.errors()` will only output an array of one item: the last error.
-* `RetryOperation` will repeatedly use the `timeouts` array. Once all of its timeouts have been used up, it restarts with the first timeout, then uses the second and so on.
+* `RetryOperation` will keep retrying with the last timeout once all of the `timeouts` have been used up.
 
 #### retryOperation.errors()
 
@@ -211,7 +212,7 @@ Defines the function `fn` that is to be retried and executes it for the first
 time right away. The `fn` function can receive an optional `currentAttempt` callback that represents the number of attempts to execute `fn` so far.
 
 Optionally defines `timeoutOps` which is an object having a property `timeout` in miliseconds and a property `cb` callback function.
-Whenever your retry operation takes longer than `timeout` to execute, the timeout callback function `cb` is called.
+Whenever your retry operation takes longer than `timeout` to execute, the timeout callback function `cb` is called with the current attempt number.
 
 
 #### retryOperation.try(fn)
diff --git a/lib/retry_operation.js b/lib/retry_operation.js
index 105ce72..f8c7a0f 100644
--- a/lib/retry_operation.js
+++ b/lib/retry_operation.js
@@ -62,7 +62,7 @@ RetryOperation.prototype.retry = function(err) {
     if (this._cachedTimeouts) {
       // retry forever, only keep last error
       this._errors.splice(0, this._errors.length - 1);
-      timeout = this._cachedTimeouts.slice(-1);
+      timeout = this._cachedTimeouts[this._cachedTimeouts.length - 1];
     } else {
       return false;
     }
@@ -107,8 +107,12 @@ RetryOperation.prototype.attempt = function(fn, timeoutOps) {
   var self = this;
   if (this._operationTimeoutCb) {
     this._timeout = setTimeout(function() {
-      self._operationTimeoutCb();
+      self._operationTimeoutCb(self._attempts);
     }, self._operationTimeout);
+
+    if (this._options.unref) {
+        this._timeout.unref();
+    }
   }
 
   this._operationStart = new Date().getTime();
diff --git a/test/integration/test-forever-timeout.js b/test/integration/test-forever-timeout.js
new file mode 100644
index 0000000..3af083f
--- /dev/null
+++ b/test/integration/test-forever-timeout.js
@@ -0,0 +1,21 @@
+var common = require('../common');
+var assert = common.assert;
+var RetryOperation = require(common.dir.lib + '/retry_operation');
+
+(function testForeverRepeatsLastTimeout() {
+  var operation = new RetryOperation([1, 2], {forever: true});
+  var originalSetTimeout = global.setTimeout;
+  var delays = [];
+  global.setTimeout = function(fn, delay) {
+    delays.push(delay);
+    return originalSetTimeout(function() {}, 0);
+  };
+
+  operation.attempt(function() {});
+  for (var i = 0; i < 4; i++) {
+    operation.retry(new Error('foo'));
+  }
+  global.setTimeout = originalSetTimeout;
+
+  assert.deepStrictEqual(delays, [1, 2, 2, 2]);
+})();
diff --git a/test/integration/test-operation-timeout.js b/test/integration/test-operation-timeout.js
new file mode 100644
index 0000000..0978d98
--- /dev/null
+++ b/test/integration/test-operation-timeout.js
@@ -0,0 +1,32 @@
+var common = require('../common');
+var assert = common.assert;
+var retry = require(common.dir.lib + '/retry');
+
+(function testOperationTimeoutReceivesAttempts() {
+  var operation = retry.operation([1]);
+  var timedOutAttempts = [];
+
+  operation.attempt(function() {}, {
+    timeout: 1,
+    cb: function(attempts) {
+      timedOutAttempts.push(attempts);
+      operation.retry(new Error('timeout'));
+    }
+  });
+
+  process.on('exit', function() {
+    assert.deepStrictEqual(timedOutAttempts, [1, 2]);
+  });
+})();
+
+(function testOperationTimeoutIsUnrefed() {
+  var operation = retry.operation({unref: true});
+
+  operation.attempt(function() {}, {
+    timeout: 60 * 1000,
+    cb: function() {}
+  });
+
+  assert.strictEqual(operation._timeout.hasRef(), false);
+  operation.stop();
+})();