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+# Type assertions
+
+The following functions all perform type checking on their argument. If the
+received value is not of the right type, the failure message will contain the
+expected type, the received type and the received value to help you identify
+better the problem.
+
+* **_AFT.assertIsNumber(value)**
+
+    Assert that the argument is a number (integer or float)
+
+* **_AFT.assertIsString(value)**
+
+    Assert that the argument is a string.
+
+* **_AFT.assertIsTable(value)**
+
+    Assert that the argument is a table.
+
+* **_AFT.assertIsBoolean(value)**
+
+    Assert that the argument is a boolean.
+
+* **_AFT.assertIsFunction(value)**
+
+    Assert that the argument is a function.
+
+* **_AFT.assertIsUserdata(value)**
+
+    Assert that the argument is a userdata.
+
+* **_AFT.assertIsThread(value)**
+
+    Assert that the argument is a coroutine (an object with type thread ).
+
+* **_AFT.assertNotIsThread(value)**
+
+    Assert that the argument is a not coroutine (an object with type thread ).
+\ No newline at end of file