doc: Document assert_string_equal().
diff --git a/include/cmocka.h b/include/cmocka.h
index 2ed56e0..ea15e14 100755
--- a/include/cmocka.h
+++ b/include/cmocka.h
@@ -449,10 +449,24 @@
__FILE__, __LINE__)
#endif
-/* Assert that the two given strings are equal, otherwise fail. */
+#ifdef DOXYGEN
+/**
+ * @brief Assert that the two given strings are equal.
+ *
+ * The function prints an error message to standard error and terminates the
+ * test by calling fail() if the strings are not equal.
+ *
+ * @param[in] a The string to check.
+ *
+ * @param[in] b The other string to compare.
+ */
+void assert_string_equal(const char *a, const char *b);
+#else
#define assert_string_equal(a, b) \
_assert_string_equal((const char*)(a), (const char*)(b), __FILE__, \
__LINE__)
+#endif
+
/* Assert that the two given strings are not equal, otherwise fail. */
#define assert_string_not_equal(a, b) \
_assert_string_not_equal((const char*)(a), (const char*)(b), __FILE__, \
