diff --git a/README.md b/README.md
index ebc7835..d450add 100644
--- a/README.md
+++ b/README.md
@@ -1,16 +1,85 @@
 
 
+<!-- > [!NOTE]
+> 
+> By default, tests are discovered by looking for sml files that start with `test_` in the `tests` directory. -->
 
-## Write Tests
-
-Create a file anywhere in the `tests` directory. The filename should be prefixed with `test_`. Otherwise, set the glob expression using `--expresion` argument.
 
 ```sh
+usage: test.py [-h] [-x] [--cache-path CACHE_PATH] [--cache-show [CACHE_SHOW]] [--cache-clear] [-k EXPRESSION]
+               [--lf] [--ff] [--nf] [--sw-skip] [--maxfail MAXFAIL] [--collect-only] [--ignore IGNORE]
+               [--ignore-glob IGNORE_GLOB] [--rootdir ROOTDIR] [--log-file LOG_FILE]
+               [--log-file-level {NOTSET,DEBUG,INFO,WARNING,ERROR,CRITICAL}]
+               [--log-file-format LOG_FILE_FORMAT] [--log-file-date-format LOG_FILE_DATE_FORMAT]
+               [--log-cli-level {NOTSET,DEBUG,INFO,WARNING,ERROR,CRITICAL}] [--log-cli-format LOG_CLI_FORMAT]
+               [--log-cli-date-format LOG_CLI_DATE_FORMAT] [--log-disable-file LOG_DISABLE_FILE]
 
-## Run Tests
+options:
+  -h, --help            show this help message and exit
+  -x, --exitfirst       Exit instantly on first error or failed test.
+  --cache-path CACHE_PATH
+                        Path to cache file.
+  --cache-show [CACHE_SHOW]
+                        Show cache contents.
+  --cache-clear         Remove all cache contents at the start of the test run.
+  -k EXPRESSION, --expression EXPRESSION
+                        Only run tests which match the given substring expression.
+  --lf, --last-failed   Rerun only the tests that failed at the last run.
+  --ff, --failed-first  Run all tests but run the last failures first.
+  --nf, --new-first     Run tests from new files first.
+  --sw-skip, --stepwise-skip
+                        Ignore the first failing test but stop on the next one.
+  --maxfail MAXFAIL     Exit after the first num failures.
+  --collect-only, --co  Only collect tests, don’t execute them.
+  --ignore IGNORE       Ignore path during collection (multi-allowed).
+  --ignore-glob IGNORE_GLOB
+                        Ignore path pattern during collection (multi-allowed).
+  --rootdir ROOTDIR     Define root directory for tests.
+  --log-file LOG_FILE   Path to a log file.
+  --log-file-level {NOTSET,DEBUG,INFO,WARNING,ERROR,CRITICAL}
+                        Level of messages to catch/display (default depends on the root log handler).
+  --log-file-format LOG_FILE_FORMAT
+                        Log format used by the logging module.
+  --log-file-date-format LOG_FILE_DATE_FORMAT
+                        Log date format used by the logging module.
+  --log-cli-level {NOTSET,DEBUG,INFO,WARNING,ERROR,CRITICAL}
+                        CLI logging level.
+  --log-cli-format LOG_CLI_FORMAT
+                        CLI log format.
+  --log-cli-date-format LOG_CLI_DATE_FORMAT
+                        CLI log date format.
+  --log-disable-file LOG_DISABLE_FILE
+                        Disable log file output.
 
-```sh
-chmod +x ./test
-./test
+```
+
+<!-- 
+## Writing Tests
+
+Source file:
+
+```sml
+(* src/program.sml *)
 
+fun factorial(0) = 1
+  | factorial(n) = n * factorial(n - 1);
 ```
+
+Test file:
+
+```sml
+(* tests/test_program_factorial.sml *)
+
+use "src/program.sml";
+use "tests/utils.sml";
+
+val testCasesFactorial = [
+  (factorial, 0, 1), (* 0! = 1 *)
+  (factorial, 1, 1), (* 1! = 1 *)
+  (factorial, 2, 2), (* 2! = 2 *)
+  (factorial, 3, 6), (* 3! = 6 *)
+  (factorial, 4, 24), (* 4! = 24 *)
+];
+
+runTestCasesIntInt(testCasesFactorial);
+``` -->