document the semicolon

w00t

README.md

@@ -30,3 +30,15 @@ Your branch is up to date with 'origin/main'.
 
 nothing to commit, working tree clean
 ```
+
+### Run commands back to back
+
+To run two commands back to back, separate them with a semicolon. Note that
+this interaction is entirely unconditional: the second command executes
+regardless of whether the first command succeeded or not.
+
+```
+c:\dev\clyde ▷ echo one; echo two
+one
+two
+```