diff --git a/List-of-deprecated-and-obsolete-C-API.md b/List-of-deprecated-and-obsolete-C-API.md
index 21eda20..03b13e6 100644
--- a/List-of-deprecated-and-obsolete-C-API.md
+++ b/List-of-deprecated-and-obsolete-C-API.md
@@ -9,4 +9,6 @@
 * [mrb_check_datatype](https://github.com/mruby/mruby/commit/b225e4cc82f0e727b6175306e530efc2a59f4e95)
 * [Data_Get_Struct](https://github.com/mruby/mruby/commit/b225e4cc82f0e727b6175306e530efc2a59f4e95)
 * [mrb_str_cat2](https://github.com/mruby/mruby/commit/0cedf8fa02848bc505d7cda29f7266b5e03a9076)
-* [ARGS_* macros](https://github.com/mruby/mruby/commit/5c88c65a11287aa52bc0a606ce96a316036aa94c)
\ No newline at end of file
+* [ARGS_* macros](https://github.com/mruby/mruby/commit/5c88c65a11287aa52bc0a606ce96a316036aa94c)
+* [mrb_str_buf_cat](https://github.com/mruby/mruby/commit/bc23a5e9e555f7a0b606856c417b9910ed92af68)
+* [mrb_str_buf_append](https://github.com/mruby/mruby/commit/91c22f32f4d5afbd53efc16933ca8cd78586b1a3)