doc: Document expect_check().
diff --git a/include/cmocka.h b/include/cmocka.h
index a9022aa..b3a4c4e 100755
--- a/include/cmocka.h
+++ b/include/cmocka.h
@@ -229,9 +229,29 @@
* parameter is provided it must be allocated on the heap and doesn't need to
* be deallocated by the caller.
*/
+#ifdef DOXYGEN
+/**
+ * @brief Add a custom parameter checking function.
+ *
+ * If the event parameter is NULL the event structure is allocated internally
+ * by this function. If the parameter is provided it must be allocated on the
+ * heap and doesn't need to be deallocated by the caller.
+ *
+ * @param[in] #function The fuction to add a custom paramater checking function
+ * for.
+ *
+ * @param[in] #parameter The parametes passed to the function.
+ *
+ * @param[in] #check_function The check function to call.
+ *
+ * @param[in] check_data The data to pass to the check function.
+ */
+void expect_check(#function, #parameter, #check_function, const void *check_data);
+#else
#define expect_check(function, parameter, check_function, check_data) \
_expect_check(#function, #parameter, __FILE__, __LINE__, check_function, \
cast_to_largest_integral_type(check_data), NULL, 0)
+#endif
/*
* Add an event to check a parameter, using check_expected(), against a set of
