diff --git a/speechmetrics/relative/__init__.py b/speechmetrics/relative/__init__.py
index bf2e691..326ac5a 100644
--- a/speechmetrics/relative/__init__.py
+++ b/speechmetrics/relative/__init__.py
@@ -1,3 +1,4 @@
 from . import bsseval
 from . import pesq
 from . import stoi
+from . import estoi
diff --git a/speechmetrics/relative/estoi.py b/speechmetrics/relative/estoi.py
new file mode 100644
index 0000000..0382a97
--- /dev/null
+++ b/speechmetrics/relative/estoi.py
@@ -0,0 +1,10 @@
+from .stoi import STOI
+
+
+class ESTOI(STOI):
+    def __init__(self, *args, **kwargs):
+        super(ESTOI, self).__init__(*args, **kwargs, estoi=True)
+
+
+def load(window, hop=None):
+    return ESTOI(window, hop)
diff --git a/speechmetrics/relative/stoi.py b/speechmetrics/relative/stoi.py
index 38a248f..fbde602 100644
--- a/speechmetrics/relative/stoi.py
+++ b/speechmetrics/relative/stoi.py
@@ -2,16 +2,19 @@
 
 
 class STOI(Metric):
-    def __init__(self, window, hop=None):
-        super(STOI, self).__init__(name='STOI', window=window, hop=hop)
+    def __init__(self, window, hop=None, estoi=False):
+        name = 'ESTOI' if estoi else 'STOI'
+        super(STOI, self).__init__(name=name, window=window, hop=hop)
         self.mono = True
+        self.estoi = estoi
 
     def test_window(self, audios, rate):
         from pystoi.stoi import stoi
         if len(audios) != 2:
             raise ValueError('STOI needs a reference and a test signals.')
 
-        return {'stoi':stoi(audios[1], audios[0], rate, extended=False)}
+        key = 'estoi' if self.estoi else 'stoi'
+        return {key: stoi(audios[1], audios[0], rate, extended=self.estoi)}
 
 
 def load(window, hop=None):