diff --git a/doc/bash.md b/doc/bash.md
new file mode 100644
index 0000000..d34e658
--- /dev/null
+++ b/doc/bash.md
@@ -0,0 +1,8 @@
+```bash
+# from previous comand
+!0 - command itself
+!^ - first argument
+!$ - last argument
+!* - all arguments
+```
+