diff --git a/radio/config/1.3/types.hal b/radio/config/1.3/types.hal
index bedb709..ba964bf 100644
--- a/radio/config/1.3/types.hal
+++ b/radio/config/1.3/types.hal
@@ -19,4 +19,10 @@
 /**
  * Contains the device capabilities with respect to the Radio HAL.
  */
-struct HalDeviceCapabilities {};
+struct HalDeviceCapabilities {
+  /**
+   * True indicates that the modem is missing features within the current
+   * version of the Radio HAL.
+   */
+  bool modemReducedFeatureSet1;
+};