diff --git a/SC2213.md b/SC2213.md
index 3f148fe..9ef44bf 100644
--- a/SC2213.md
+++ b/SC2213.md
@@ -36,7 +36,7 @@ Either add a case to handle the flag, or remove it from the `getopts` option str
 
 ShellCheck may not correctly recognize less canonical uses of `while getopts ..; do case ..;`, such as when modifying the variable before using it:
 
-```
+```sh
 while getopts "rf-:" OPT; do
   if [ "$OPT" = "-" ]; then   # long option: reformulate OPT and OPTARG
     OPT="${OPTARG%%=*}"       # extract long option name