diff --git a/thefuck/rules/upper_to_lowercase.py b/thefuck/rules/upper_to_lowercase.py
new file mode 100644
index 00000000..9029e776
--- /dev/null
+++ b/thefuck/rules/upper_to_lowercase.py
@@ -0,0 +1,8 @@
+def match(command):
+    return command.script.isupper()
+
+
+def get_new_command(command):
+    return command.script.lower()
+
+priority = 0