include: Document assert_non_null().
diff --git a/include/cmocka.h b/include/cmocka.h
index efb472f..c3b50f7 100755
--- a/include/cmocka.h
+++ b/include/cmocka.h
@@ -366,9 +366,23 @@
__FILE__, __LINE__)
#endif
-/* Assert that the given pointer is non-NULL. */
+#ifdef DOXYGEN
+/**
+ * @brief Assert that the given pointer is non-NULL.
+ *
+ * The function prints an error message to standard error and terminates the
+ * test by calling fail() if the pointer is non-NULL.
+ *
+ * @param[in] pointer The pointer to evaluate.
+ *
+ * @see assert_null()
+ */
+void assert_non_null(void *pointer);
+#else
#define assert_non_null(c) _assert_true(cast_ptr_to_largest_integral_type(c), #c, \
-__FILE__, __LINE__)
+ __FILE__, __LINE__)
+#endif
+
/* Assert that the given pointer is NULL. */
#define assert_null(c) _assert_true(!(cast_ptr_to_largest_integral_type(c)), #c, \
__FILE__, __LINE__)
