diff --git a/ChangeLog.md b/ChangeLog.md
index a1a6b87..2f4663e 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,43 +1,93 @@
-[semver](https://semver.org/) is implied.
-
-# 0.3.0-dev
-
-*Not Released Yet*
-
-## New Features
-
-- Introduced `PIPE(...)` macro.
-- Introduced `PANIC(...)` logging function. It's like `ERRO(...)` but crashes the whole application.
-
-## Deprecations
-
-- `FOREACH_VARGS(...)` is deprecated. Use `FOREACH_VARGS_CSTR(...)` instead.
-
-# 0.2.0 — Removing Everything
-
-*2021-01-30*
-
-- Introduced `ENDS_WITH(str, postfix)` function that checks if `str` ends with `postfix`.
-- Introduced `IS_DIR(path)` function that checks if `path`is a directory.
-- Introduced `RM(path)` function that removes the specified path. It does not care if the path is file or directory, it just removes everything recursive every time.
-
-# 0.1.0 — Cleaning Things Up. Figuring Out Conventions.
-
-*2021-01-27*
-
-- Introduced logging functions `INFO(fmt, ...)`, `WARN(fmt, ...)`, `ERRO(fmt, ...)`.
-- Introduced API conventions. Functions that start with `nobuild__` (double underscore) are private to the library and should not be relied upon. They can be changed in any release without a warning.
-
-## Deprecations
-
-All the deprecated functions and macros will be removed in the next major release.
-
-- `remove_ext(path)` is deprecated. Use `NOEXT(path)` instead.
-- `CONCAT_SEP(sep, ...)` is deprecated. Use `JOIN(sep, ...)` instead.
-- `concat_sep_impl(sep, ...)` is deprecated. Use `JOIN(sep, ...)` instead.
-
-# 0.0.1 — First Official Release
-
-*2021-01-27*
-
-- Implemented enough functionality to build https://github.com/tsoding/bm
+# Changelog
+
+# [0.3.0-dev]
+
+_Not Released Yet_
+
+### Changed
+
+- Have `CMD` macro use the added command system
+
+### Added
+
+- Define `GO_REBUILD_URSELF` macro to add code for rebuilding the executable if `nobuild.c` was modified.
+- Add `rebuild_urself()` as backend for `GO_REBUILD_URSELF`.
+- Add `Cstr` as type alias to `const char *`
+- Define a type struct `Cstr_Array` for an array of `Cstr` that stores its length.
+- Add `cstr_array_make()` for creating a `Cstr_Array` for varargs. The list must be NULL terminated.
+- Add `cstr_array_append()` to create a new `Cstr_Array` and append a `Cstr` to it.
+- Add `cstr_ends_with()`  function
+- Add `cstr_array_join()` function
+- Add `cstr_no_ext()` function
+- Add `VLOG()` function that acts as the backend of each logging function.
+- Add `PANIC()` function. It's like `ERRO()` but crashes the whole application.
+- Add `Cmd` struct to represent a single command line.
+- Add `Cmd_Array` struct to represent a series of command lines, storing the number of commands.
+- Add `Fd` as type alias for File descriptor.
+- Add `Pid` as type alias for process ID.
+- Add `pid_wait()` to wait until the process with the specified pid is finished.
+- Add `cmd_show()` to render the cmd to stdout.
+- Add `cmd_run_async()` to run the `cmd` asynchronously with custom input and output.
+- Add `cmd_run_sync()` to run `cmd` synchronously.
+- Add `fd_open_for_read()` to open a path for reading and return a file descriptor to it.
+- Add `fd_open_for_write()` to open a path for writing and return a file descriptor to it.
+- Add `fd_close()` to close a file descriptor.
+- Add `path_rm()` function.
+- Add `path_mkdirs()` function.
+- Add `path_rename()` to rename a path.
+- Define `RENAME()` macro helper.
+- Add `path_exists()` function.
+- Define `PATH_EXISTS()` macro helper.
+- Add `gcc` printf attributes to logging functions.
+- Add `Pipe` struct that represents a shell pipe.
+- Add `pipe_make()` function to have the os create the pipe.
+- Define `PIPE()` macro helper to create a pipe for chaining commands.
+- Add `Chain_Token` struct that represent a part redirectable entity.
+- Add `Chain` struct that represents a series of commands piped to each other.
+- Add `chain_run_sync()` to run a chain synchronously.
+- Add `chain_echo()` to echo a chain.
+- Add `chain_build_from_tokens()` to build a chain from tokens.
+- Define `CHAIN()` macro helper to create a `Chain` from a series of `Chain_Tokens`.
+- Add `Chain_Token_Type` enum to store the different types of tokens.
+- Add `IN()` macro to create an input `Chain_Token`.
+- Add `OUT()`  macro to create an output `Chain_Token`.
+- Add `CHAIN_CMD()` to represent a command that is run as part of the chain.
+- Add `shift_args()` function.
+
+### Removed
+
+- `PATH_SEP_LEN`
+- `FOREACH_VARGS`
+- `CONCAT_SEP(sep, ...) build__deprecated_concat_sep(sep, __VA_ARGS__, NULL)`
+- `concat_impl(int ignore, ...)`;
+- `concat_sep_impl(const char *sep, ...)`;
+- `build__join(const char *sep, ...)`;
+- `mkdirs_impl(int ignore, ...)`;
+- `cmd_impl(int ignore, ...)`;
+- `remove_ext(const char *path)`;
+- `shift(int *argc, char ***argv)`;
+
+## [0.2.0] - 2021-01-30
+
+## Added
+
+- Add `ENDS_WITH(str, postfix)` function that checks if `str` ends with `postfix`.
+- Add `IS_DIR(path)` function that checks if `path` is a directory.
+- Add `RM(path)` function that removes the specified path recursively.
+
+# [0.1.0] - 2021-01-27
+
+### Changed
+
+- Deprecate `remove_ext(path)`. Use `NOEXT(path)` instead.
+- Deprecate `CONCAT_SEP(sep, ...)`. Use `JOIN(sep, ...)` instead.
+- Deprecate `concat_sep_impl(sep, ...)`. Use `JOIN(sep, ...)` instead.
+
+### Added
+
+- Add logging functions `INFO(fmt, ...)`, `WARN(fmt, ...)`, `ERRO(fmt, ...)`.
+- Introduce API conventions. Functions that start with `nobuild__` (double underscore) are private to the library and should not be relied upon. They can be changed in any release without a warning.
+
+## [0.0.1] - 2021-01-27
+
+_Implemented enough functionality to build [bm](https://github.com/tsoding/bm.md)._