diff --git a/shell-completion/zsh/_systemd-nspawn b/shell-completion/zsh/_systemd-nspawn
index 384e3f2c308..adc5d7c8a04 100644
--- a/shell-completion/zsh/_systemd-nspawn
+++ b/shell-completion/zsh/_systemd-nspawn
@@ -49,4 +49,5 @@ _arguments \
     '--personality=[Control the architecture ("personality") reported by uname(2) in the container.]:architecture:(x86 x86-64)' \
     '--volatile=[Run the system in volatile mode.]:volatile:(no yes state)' \
     "--notify-ready=[Control when the ready notification is sent]:options:(yes no)" \
+    "--suppress-sync=[Control whether to suppress disk synchronization for the container payload]:options:(yes no)" \
     '*:: : _normal'