diff --git a/qemu-options.hx b/qemu-options.hx
index 07add8bedc..b1e5781908 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3623,7 +3623,7 @@ A virtual watchdog for s390x backed by the diagnose 288 hypercall
 ETEXI
 
 DEF("watchdog-action", HAS_ARG, QEMU_OPTION_watchdog_action, \
-    "-watchdog-action reset|shutdown|poweroff|pause|debug|none\n" \
+    "-watchdog-action reset|shutdown|poweroff|inject-nmi|pause|debug|none\n" \
     "                action when watchdog fires [default=reset]\n",
     QEMU_ARCH_ALL)
 STEXI
@@ -3637,6 +3637,7 @@ The default is
 Other possible actions are:
 @code{shutdown} (attempt to gracefully shutdown the guest),
 @code{poweroff} (forcefully poweroff the guest),
+@code{inject-nmi} (inject a NMI into the guest),
 @code{pause} (pause the guest),
 @code{debug} (print a debug message and continue), or
 @code{none} (do nothing).