diff --git a/asdf.sh b/asdf.sh
index 48247d9a..ea8e490a 100644
--- a/asdf.sh
+++ b/asdf.sh
@@ -1,5 +1,9 @@
 #!/usr/bin/env bash
 
+# For Korn shells (ksh, mksh, etc.), capture $_ (the final parameter passed to
+# the last command) straightaway, as it will contain the path to this script.
+# For Bash, ${BASH_SOURCE[0]} will be used to obtain this script's path.
+# For Zsh and others, $0 (the path to the shell or script) will be used.
 _under="$_"
 if [[ "$_under" == *".sh" ]]; then
   current_script_path="$_under"