diff --git a/SC2148.md b/SC2148.md
index db6cc9d..6236843 100644
--- a/SC2148.md
+++ b/SC2148.md
@@ -24,12 +24,16 @@ echo "$RANDOM"  # Supported in bash. No warnings.
 
 Different shells support different features. To give effective advice, ShellCheck needs to know which shell your script is going to run on. You will get a different numbers of warnings about different things depending on your target shell.
 
-ShellCheck normally determines your target shell from the shebang (having e.g. `#!/bin/sh` as the first line). The shell can also be specified from the CLI with `-s`, e.g. `shellcheck -s sh file`.
+If you add a shebang (e.g. `#!/bin/bash` as the first line), the OS will use this interpreter when the script is executed, and ShellCheck will use this shell when offering advice.
 
-If you don't specify shebang nor `-s`, ShellCheck gives this message and proceeds with some default (`bash`).
+If you for any reason can't or won't add a shebang, there are multiple other ways to let shellcheck know which shell you're coding for:
+
+* Specify the shell using the `-s` or `--shell` flag, e.g. `shellcheck -s bash myfile`
+* Use a shellcheck [[directive]], adding `# shellcheck shell=ksh` before the first command in the file.
+* Give the script a `.bash`, `.ksh` or `.dash` extension (`.sh` will not assume `--shell=sh` since it's so generic)
 
 Note that this error can not be ignored with a [[directive]]. It is not a suggestion to improve your script, but a warning that ShellCheck lacks information it needs to be helpful.
 
 ### Exceptions
 
-None. Please either add a shebang or use `-s`.
+None. Please either add a shebang, directive, extension or use `-s`.
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