docs: clarify PATH configuration in README

README.md

@@ -55,7 +55,7 @@ You just type `opencode` from any project directory and it runs sandboxed.
 
 If a non-sandboxed `opencode` appears *earlier* on your `PATH` than the
 wrapper, typing `opencode` will bypass the sandbox. The installer detects and
-warns about this. Fix it with:
+warns about this. Fix it by adding this to your shell config file (e.g., `~/.bashrc` or `~/.zshrc`):
 
 ```bash
 export PATH="$HOME/.local/bin:$PATH"
@@ -118,7 +118,7 @@ Then run from any directory:
 nono-tui
 ```
 
-Make sure `~/.local/bin` is on your `PATH`:
+Make sure `~/.local/bin` is on your `PATH`. If it isn't, add this to your shell config file (e.g., `~/.bashrc` or `~/.zshrc`):
 
 ```bash
 export PATH="$HOME/.local/bin:$PATH"