diff --git a/src/rules/lowercase.js b/src/rules/lowercase.js
new file mode 100644
index 00000000..e7a45496
--- /dev/null
+++ b/src/rules/lowercase.js
@@ -0,0 +1,32 @@
+/*
+ * Rule: properties and functions should be lowercase
+ */
+
+CSSLint.addRule({
+
+    // rule information
+    id: "lowercase",
+    name: "Require lowercase properties and functions",
+    desc: "All properties and functions should be lowercase",
+    browsers: "All",
+
+    // initialization
+    init: function(parser, reporter) {
+        "use strict";
+        var rule = this;
+
+        parser.addListener("property", function(event) {
+            var prop = event.property.text,
+                func = /([a-z\-]+)\(/i.exec(event.value.text);
+
+            if (prop !== prop.toLowerCase()) {
+                reporter.report("Property is not lowercase.", event.line, event.col, rule);
+            } else if (func) {
+                if (func[1] !== func[1].toLowerCase()) {
+                    reporter.report("Function is not lowercase.", event.line, event.col, rule);
+                }
+            }
+        });
+    }
+
+});
diff --git a/tests/rules/lowercase.js b/tests/rules/lowercase.js
new file mode 100644
index 00000000..2ac54210
--- /dev/null
+++ b/tests/rules/lowercase.js
@@ -0,0 +1,38 @@
+(function() {
+    "use strict";
+    var Assert = YUITest.Assert;
+
+    YUITest.TestRunner.add(new YUITest.TestCase({
+
+        name: "lowercase rule errors",
+
+        "A property that is not in lowercase should result in a warning": function() {
+            var result = CSSLint.verify("h1 { Border-Radius: 5px; }", { "lowercase": 1 });
+
+            Assert.areEqual(1, result.messages.length);
+            Assert.areEqual("warning", result.messages[0].type);
+            Assert.areEqual("Property is not lowercase.", result.messages[0].message);
+        },
+
+        "A property that is in lowercase should not result in a warning": function() {
+            var result = CSSLint.verify("h1 { border-radius: 5px; }", { "lowercase": 1 });
+
+            Assert.areEqual(0, result.messages.length);
+        },
+
+        "A function that is not in lowercase should result in a warning": function() {
+            var result = CSSLint.verify("h1 { color: RGB(0, 0, 0); }", { "lowercase": 1 });
+
+            Assert.areEqual(1, result.messages.length);
+            Assert.areEqual("warning", result.messages[0].type);
+            Assert.areEqual("Function is not lowercase.", result.messages[0].message);
+        },
+
+        "A function that is in lowercase should not result in a warning": function() {
+            var result = CSSLint.verify("h1 { color: rgb(0, 0, 0); }", { "lowercase": 1 });
+
+            Assert.areEqual(0, result.messages.length);
+        }
+    }));
+
+})();