diff --git a/README.md b/README.md
index 3052ebc..586be94 100644
--- a/README.md
+++ b/README.md
@@ -75,10 +75,10 @@ If stderr is not easily accessible for you, you can redirect the output to a fil
 
 You can also pass a stream or a callable instead, and they'll be used.
 
-See values of some variables that aren't local variables:
+See values of some expressions that aren't local variables:
 
 ```python
-@pysnooper.snoop(variables=('foo.bar', 'self.whatever'))
+@pysnooper.snoop(watch=('foo.bar', 'self.x["whatever"]'))
 ```
 
 Expand values to see all their attributes or items of lists/dictionaries:
diff --git a/pysnooper/__init__.py b/pysnooper/__init__.py
index a2c0126..05156d3 100644
--- a/pysnooper/__init__.py
+++ b/pysnooper/__init__.py
@@ -2,13 +2,13 @@
 # This program is distributed under the MIT license.
 
 from .pysnooper import snoop
-from .variables import Attrs, Exploded, Indices, Keys
+from .variables import Attrs, Exploding, Indices, Keys
 import collections
 
 __VersionInfo = collections.namedtuple('VersionInfo',
                                        ('major', 'minor', 'micro'))
 
-__version__ = '0.0.26'
+__version__ = '0.0.27'
 __version_info__ = __VersionInfo(*(map(int, __version__.split('.'))))
 
 del collections, __VersionInfo # Avoid polluting the namespace
diff --git a/pysnooper/pysnooper.py b/pysnooper/pysnooper.py
index 7df98ea..cebfd51 100644
--- a/pysnooper/pysnooper.py
+++ b/pysnooper/pysnooper.py
@@ -39,7 +39,8 @@ def get_write_and_truncate_functions(output):
     return (write, truncate)
 
 
-def snoop(output=None, variables=(), exploded_variables=(), depth=1, prefix='', overwrite=False):
+def snoop(output=None, watch=(), watch_explode=(), depth=1,
+          prefix='', overwrite=False):
     '''
     Snoop on the function, writing everything it's doing to stderr.
 
@@ -54,9 +55,9 @@ def snoop(output=None, variables=(), exploded_variables=(), depth=1, prefix='',
 
         @pysnooper.snoop('/my/log/file.log')
 
-    See values of some variables that aren't local variables::
+    See values of some expressions that aren't local variables::
 
-        @pysnooper.snoop(variables=('foo.bar', 'self.whatever'))
+        @pysnooper.snoop(watch=('foo.bar', 'self.x["whatever"]'))
 
     Expand values to see all their attributes or items of lists/dictionaries:
 
@@ -79,10 +80,11 @@ def snoop(output=None, variables=(), exploded_variables=(), depth=1, prefix='',
                         "content to file.")
     def decorate(function):
         target_code_object = function.__code__
-        tracer = Tracer(target_code_object=target_code_object, write=write,
-                        truncate=truncate, variables=variables, depth=depth,
-                        prefix=prefix, overwrite=overwrite,
-                        exploded_variables=exploded_variables)
+        tracer = Tracer(
+            target_code_object=target_code_object, write=write,
+            truncate=truncate, watch=watch, watch_explode=watch_explode,
+            depth=depth, prefix=prefix, overwrite=overwrite
+        )
 
         def inner(function_, *args, **kwargs):
             with tracer:
diff --git a/pysnooper/tracer.py b/pysnooper/tracer.py
index 7bf507f..6c5e4c8 100644
--- a/pysnooper/tracer.py
+++ b/pysnooper/tracer.py
@@ -7,7 +7,7 @@ import collections
 import datetime as datetime_module
 import itertools
 
-from .variables import CommonVariable, Exploded, BaseVariable
+from .variables import CommonVariable, Exploding, BaseVariable
 from .third_party import six
 from . import utils
 
@@ -15,10 +15,10 @@ from . import utils
 ipython_filename_pattern = re.compile('^<ipython-input-([0-9]+)-.*>$')
 
 
-def get_local_reprs(frame, variables=()):
+def get_local_reprs(frame, watch=()):
     result = {key: utils.get_shortish_repr(value) for key, value
                                                      in frame.f_locals.items()}
-    for variable in variables:
+    for variable in watch:
         result.update(variable.items(frame))
     return result
 
@@ -99,17 +99,17 @@ def get_source_from_frame(frame):
 
 
 class Tracer:
-    def __init__(self, target_code_object, write, truncate, variables=(),
-                 exploded_variables=(), depth=1, prefix='', overwrite=False):
+    def __init__(self, target_code_object, write, truncate, watch=(),
+                 watch_explode=(), depth=1, prefix='', overwrite=False):
         self.target_code_object = target_code_object
         self._write = write
         self.truncate = truncate
-        self.variables = [
+        self.watch = [
             v if isinstance(v, BaseVariable) else CommonVariable(v)
-            for v in utils.ensure_tuple(variables)
+            for v in utils.ensure_tuple(watch)
          ] + [
-             v if isinstance(v, BaseVariable) else Exploded(v)
-             for v in utils.ensure_tuple(exploded_variables)
+             v if isinstance(v, BaseVariable) else Exploding(v)
+             for v in utils.ensure_tuple(watch_explode)
         ]
         self.frame_to_old_local_reprs = collections.defaultdict(lambda: {})
         self.frame_to_local_reprs = collections.defaultdict(lambda: {})
@@ -168,7 +168,7 @@ class Tracer:
         self.frame_to_old_local_reprs[frame] = old_local_reprs = \
                                                self.frame_to_local_reprs[frame]
         self.frame_to_local_reprs[frame] = local_reprs = \
-                               get_local_reprs(frame, variables=self.variables)
+                                       get_local_reprs(frame, watch=self.watch)
 
         modified_local_reprs = {}
         newish_local_reprs = {}
diff --git a/pysnooper/variables.py b/pysnooper/variables.py
index c556cda..6a97666 100644
--- a/pysnooper/variables.py
+++ b/pysnooper/variables.py
@@ -96,7 +96,7 @@ class Indices(Keys):
         return result
 
 
-class Exploded(BaseVariable):
+class Exploding(BaseVariable):
     def _items(self, main_value):
         if isinstance(main_value, Mapping):
             cls = Keys
diff --git a/tests/test_pysnooper.py b/tests/test_pysnooper.py
index 40435a5..10d3620 100644
--- a/tests/test_pysnooper.py
+++ b/tests/test_pysnooper.py
@@ -74,7 +74,7 @@ def test_callable():
 
 
 
-def test_variables():
+def test_watch():
 
     class Foo(object):
         def __init__(self):
@@ -83,7 +83,7 @@ def test_variables():
         def square(self):
             self.x **= 2
 
-    @pysnooper.snoop(variables=(
+    @pysnooper.snoop(watch=(
             'foo.x',
             'io.__name__',
             'len(foo.__dict__["x"] * "abc")',
@@ -125,14 +125,14 @@ def test_variables():
     )
 
 
-def test_exploded_variables():
+def test_watch_explode():
     class Foo:
         def __init__(self, x, y):
             self.x = x
             self.y = y
 
 
-    @pysnooper.snoop(exploded_variables=('_d', '_point', 'lst'))
+    @pysnooper.snoop(watch_explode=('_d', '_point', 'lst'))
     def my_function():
         _d = {'a': 1, 'b': 2, 'c': 'ignore'}
         _point = Foo(x=3, y=4)
@@ -180,7 +180,7 @@ def test_variables_classes():
             self.x = 3
             self.y = 4
 
-    @pysnooper.snoop(variables=(
+    @pysnooper.snoop(watch=(
             pysnooper.Keys('_d', exclude='c'),
             pysnooper.Attrs('_d'),  # doesn't have attributes
             pysnooper.Attrs('_s'),
@@ -221,7 +221,7 @@ def test_variables_classes():
 
 
 
-def test_single_variable_no_comma():
+def test_single_watch_no_comma():
 
     class Foo(object):
         def __init__(self):
@@ -230,7 +230,7 @@ def test_single_variable_no_comma():
         def square(self):
             self.x **= 2
 
-    @pysnooper.snoop(variables='foo')
+    @pysnooper.snoop(watch='foo')
     def my_function():
         foo = Foo()
         for i in range(2):
@@ -376,7 +376,7 @@ def test_method_and_prefix():
         def __init__(self):
             self.x = 2
 
-        @pysnooper.snoop(variables=('self.x',), prefix='ZZZ')
+        @pysnooper.snoop(watch=('self.x',), prefix='ZZZ')
         def square(self):
             foo = 7
             self.x **= 2