diff --git a/argcomplete/shell_integration.py b/argcomplete/shell_integration.py
index c41e194..e84f507 100644
--- a/argcomplete/shell_integration.py
+++ b/argcomplete/shell_integration.py
@@ -75,6 +75,10 @@
 if [[ -z "${ZSH_VERSION-}" ]]; then
     complete %(complete_opts)s -F _python_argcomplete%(function_suffix)s %(executables)s
 else
+    # When called by the Zsh completion system, this will end with
+    # "loadautofunc" when initially autoloaded and "shfunc" later on, otherwise,
+    # the script was "eval"-ed so use "compdef" to register it with the
+    # completion system
     autoload is-at-least
     if [[ $zsh_eval_context == *func ]]; then
         _python_argcomplete%(function_suffix)s "$@"