diff --git a/click/_compat.py b/click/_compat.py
index 312e7297c0..d072224c10 100644
--- a/click/_compat.py
+++ b/click/_compat.py
@@ -12,7 +12,7 @@
 DEFAULT_COLUMNS = 80
 
 
-_ansi_re = re.compile('\033\[((?:\d|;)*)([a-zA-Z])')
+_ansi_re = re.compile(r'\033\[((?:\d|;)*)([a-zA-Z])')
 
 
 def get_filesystem_encoding():
diff --git a/click/core.py b/click/core.py
index b307407d67..8358172323 100644
--- a/click/core.py
+++ b/click/core.py
@@ -1230,7 +1230,7 @@ def list_commands(self, ctx):
 
 
 class Parameter(object):
-    """A parameter to a command comes in two versions: they are either
+    r"""A parameter to a command comes in two versions: they are either
     :class:`Option`\s or :class:`Argument`\s.  Other subclasses are currently
     not supported by design as some of the internals for parsing are
     intentionally not finalized.
diff --git a/click/decorators.py b/click/decorators.py
index 64af01553d..c0b9e85a39 100644
--- a/click/decorators.py
+++ b/click/decorators.py
@@ -90,7 +90,7 @@ def _make_command(f, name, attrs, cls):
 
 
 def command(name=None, cls=None, **attrs):
-    """Creates a new :class:`Command` and uses the decorated function as
+    r"""Creates a new :class:`Command` and uses the decorated function as
     callback.  This will also automatically attach all decorated
     :func:`option`\s and :func:`argument`\s as parameters to the command.