diff --git a/modules/zsh/module.json b/modules/zsh/module.json
index feabc70..04fb1d2 100644
--- a/modules/zsh/module.json
+++ b/modules/zsh/module.json
@@ -51,7 +51,7 @@
       "mode": "0644",
       "into": "block",
       "at": "start",
-      "content": "# The mesh's block (module zsh, novox/hq ADR 0203, ADR 0204): the account's environment, read by\n# every zsh — a login, a script, and node-login-shell's execute. Replaced at every push; everything\n# outside it is yours.\nif [[ -r \"${machine:account-home}/.config/mesh/environment.sh\" ]]; then\n  source \"${machine:account-home}/.config/mesh/environment.sh\"\nfi\n"
+      "content": "# The mesh's block (module zsh, novox/hq ADR 0203, ADR 0204): the account's environment, read by\n# every zsh — a login, a script, and node-login-shell's execute. Replaced at every push; everything\n# outside it is yours.\n# PATH keeps each directory once, wherever it was added: the session, a nested shell or a\n# sourced file. Without it every nested shell prepended the same entries again.\ntypeset -U path PATH\nif [[ -r \"${machine:account-home}/.config/mesh/environment.sh\" ]]; then\n  source \"${machine:account-home}/.config/mesh/environment.sh\"\nfi\n"
     },
     {
       "id": "rc",