Improve comment on conditional check for regex

Author: Michael Saki

setup-env

@@ -54,7 +54,9 @@ LONGOPTS="force,help,install-hooks,list-versions,python-version:,venv-name:"
 # Define short options for getopt
 SHORTOPTS="fhilp:v:"
 
-# Check if GNU getopt is available
+# Check for GNU getopt by matching a specific pattern ("getopt from util-linux")
+# in its version output. This approach presumes the output format remains stable.
+# Be aware that format changes could invalidate this check.
 if [[ $(getopt --version 2> /dev/null) != *"getopt from util-linux"* ]]; then
   cat << 'END_OF_LINE'