diff --git a/pymule/__init__.py b/pymule/__init__.py
index b1741aa24531986456158b2bb53e347fd04f0d94..9bd46672f073d0d711787cdfb776097c7b451c83 100644
--- a/pymule/__init__.py
+++ b/pymule/__init__.py
@@ -4,6 +4,21 @@ try:
 except NameError:
     pass
 
+__all__ = [
+    'np', 'plt',
+    'mergenumbers', 'plusnumbers', 'dividenumbers', 'timesnumbers',
+    'mergeplots', 'addplots', 'divideplots', 'scaleplot',
+    'combineplots', 'combineNplots',
+    'integratehistogram', 'mergebins',
+    'importreg', 'pattern', 'setup', 'sigma',
+    'mergeset', 'mergeseeds', 'mergefks',
+    'addsets', 'scaleset',
+    'errorband', 'kplot', 'watermark',
+    'pi', 'alpha', 'GF', 'conv', 'Mmu', 'Mel', 'Mtau',
+    'importvegas', 'mulify'
+]
+
+
 import numpy as np
 import matplotlib.pyplot as plt