fix and improve

README.md

@@ -6,6 +6,14 @@ Don't get me wrong, this is nothing related to [GDB Python
 interface](https://sourceware.org/gdb/current/onlinedocs/gdb/Python-API.html#Python-API).
 This API is for extending GDB, whereas GDB Tester is for scripting it.
 
+**Try it**
+----------
+
+This command should benchmark GDB breakpoints:
+
+    python3 -c 'import gdb_tester; gdb_tester.main(pkg_prefix="gdb_tester.gdb_testing")'
+
+
 Where and how to specify unit-tests and benchmarks
 ------------------------------------------------
 
@@ -139,4 +147,4 @@ vanilla GDB:
              prepare_and_run()
              gdb.reset(hard=(not no_mcgdb))
         
-         gdb.quit()
\ No newline at end of file
+         gdb.quit()