diff --git a/tuned/profiles/functions/function_assertion.py b/tuned/profiles/functions/function_assertion.py
new file mode 100644
index 0000000..2638672
--- /dev/null
+++ b/tuned/profiles/functions/function_assertion.py
@@ -0,0 +1,25 @@
+import os
+import tuned.logs
+import base
+from tuned.utils.commands import commands
+from tuned.profiles.exceptions import InvalidProfileException
+
+log = tuned.logs.get()
+
+class assertion(base.Function):
+	"""
+	Assertion: compares argument 2 with argument 3. If they don't match
+	it logs text from argument 1 and  throws InvalidProfileException. This
+	exception will abort profile loading.
+	"""
+	def __init__(self):
+		# 2 arguments
+		super(self.__class__, self).__init__("exec", 3)
+
+	def execute(self, args):
+		if not super(self.__class__, self).execute(args):
+			return None
+		if args[1] != args[2]:
+			log.error("assertion '%s' failed: '%s' != '%s'" % (args[0], args[1], args[2]))
+			raise InvalidProfileException("Assertion '%s' failed." % args[0])
+		return None