diff --git a/radio/1.4/IRadio.hal b/radio/1.4/IRadio.hal
index c7a2c6b..8438777 100644
--- a/radio/1.4/IRadio.hal
+++ b/radio/1.4/IRadio.hal
@@ -106,6 +106,11 @@
      * Note this API is the same as IRadio.dial except using the
      * @1.4::EmergencyServiceCategory as the input param.
      *
+     * If the number in the 'dialInfo' field is identified as an emergency number in Android,
+     * Android use this request for its emergency call instead of @1.0::IRadio.dial. The
+     * implementation decides how to handle the call (e.g. emergency routing or normal
+     * routing).
+     *
      * If the dialed emergency number does not have a specified emergency service category, the
      * 'categories' field is set to @1.4::EmergencyServiceCategory#UNSPECIFIED; iff either the
      * 'categories' field is set to @1.4::EmergencyServiceCategory#UNSPECIFIED or the underlying