diff --git a/zephyr-env.sh b/zephyr-env.sh
index 21f47946e32255..0e75530e68f010 100644
--- a/zephyr-env.sh
+++ b/zephyr-env.sh
@@ -19,6 +19,9 @@
 # to the name of the function/script when executing a shell function or
 # sourcing a script. POSIX_ARGZERO option, when it is set, exposes the
 # original value of $0 in spite of the current FUNCTION_ARGZERO setting.
+#
+# Note: The version of zsh need to be 5.0.6 or above. Any versions below
+# 5.0.6 maybe encoutner errors when sourcing this script.
 if [ -n "$ZSH_VERSION" ]; then
 	DIR="${(%):-%N}"
 	if [ $options[posixargzero] != "on" ]; then