doc: Document assert_string_not_equal().
diff --git a/include/cmocka.h b/include/cmocka.h
index ea15e14..3c13c88 100755
--- a/include/cmocka.h
+++ b/include/cmocka.h
@@ -467,10 +467,23 @@
__LINE__)
#endif
-/* Assert that the two given strings are not equal, otherwise fail. */
+#ifdef DOXYGEN
+/**
+ * @brief Assert that the two given strings are not equal.
+ *
+ * The function prints an error message to standard error and terminates the
+ * test by calling fail() if the strings are equal.
+ *
+ * @param[in] a The string to check.
+ *
+ * @param[in] b The other string to compare.
+ */
+void assert_string_not_equal(const char *a, const char *b);
+#else
#define assert_string_not_equal(a, b) \
_assert_string_not_equal((const char*)(a), (const char*)(b), __FILE__, \
__LINE__)
+#endif
/* Assert that the two given areas of memory are equal, otherwise fail. */
#define assert_memory_equal(a, b, size) \