diff --git a/xyz/openbmc_project/State/Host.interface.yaml b/xyz/openbmc_project/State/Host.interface.yaml
index 8f481b8..202af16 100644
--- a/xyz/openbmc_project/State/Host.interface.yaml
+++ b/xyz/openbmc_project/State/Host.interface.yaml
@@ -45,3 +45,9 @@
         - name: 'Quiesced'
           description: >
             Host firmware is quiesced
+        - name: 'DiagnosticMode'
+          description: >
+            Host firmware is capturing debug information. Powering off your
+            system while the host is in this state will prevent the debug data
+            from being properly collected. The host will move to one of the
+            other states once complete.