diff --git a/README.md b/README.md
index 8b98fec2..6d584ed2 100644
--- a/README.md
+++ b/README.md
@@ -106,6 +106,12 @@ If it fails try to use `easy_install`:
 sudo easy_install thefuck
 ```
 
+Or using an OS package manager (currently supported in OSX via [brew](http://brew.sh)):
+
+```bash
+brew install thefuck
+```
+
 And add to `.bashrc` or `.zshrc` or `.bash_profile`(for OSX):
 
 ```bash
@@ -175,7 +181,7 @@ and `get_new_command(command: Command, settings: Settings) -> str`.
 
 `Command` has three attributes: `script`, `stdout` and `stderr`.
 
-`Settings` is `~/.thefuck/settings.py`.
+`Settings` is a special object filled with `~/.thefuck/settings.py` and values from env, [more](#settings).
 
 Simple example of the rule for running script with `sudo`:
 
diff --git a/tests/rules/test_rm_dir.py b/tests/rules/test_rm_dir.py
index 2d5ed623..1608047d 100644
--- a/tests/rules/test_rm_dir.py
+++ b/tests/rules/test_rm_dir.py
@@ -4,6 +4,7 @@ from thefuck.rules.rm_dir import match, get_new_command
 
 def test_match():
     assert match(Command('rm foo', '', 'rm: foo: is a directory'), None)
+    assert match(Command('rm foo', '', 'rm: foo: Is a directory'), None)
     assert not match(Command('rm foo', '', ''), None)
     assert not match(Command('rm foo', '', 'foo bar baz'), None)
     assert not match(Command('', '', ''), None)
diff --git a/thefuck/rules/rm_dir.py b/thefuck/rules/rm_dir.py
index 557278b2..89b1d2bb 100644
--- a/thefuck/rules/rm_dir.py
+++ b/thefuck/rules/rm_dir.py
@@ -5,7 +5,7 @@ from thefuck.utils import sudo_support
 @sudo_support
 def match(command, settings):
     return ('rm' in command.script
-            and 'is a directory' in command.stderr)
+            and 'is a directory' in command.stderr.lower())
 
 
 @sudo_support