diff --git a/radio/1.0/IRadio.hal b/radio/1.0/IRadio.hal
index b3e3e98..0b1bf40 100644
--- a/radio/1.0/IRadio.hal
+++ b/radio/1.0/IRadio.hal
@@ -630,7 +630,6 @@
 
     /*
      * Scans for available networks
-     * This request must not respond until the new operator is selected and registered.
      *
      * @param serial Serial number of request.
      *
diff --git a/radio/1.0/IRadioResponse.hal b/radio/1.0/IRadioResponse.hal
index cd0899a..bf50792 100644
--- a/radio/1.0/IRadioResponse.hal
+++ b/radio/1.0/IRadioResponse.hal
@@ -787,10 +787,13 @@
      *
      * Valid errors returned:
      *   RadioError:NONE
-     *   RadioError:INVALID_ARGUMENTS
      *   RadioError:RADIO_NOT_AVAILABLE
      *   RadioError:OPERATION_NOT_ALLOWED
-     *   RadioError:GENERIC_FAILURE
+     *   RadioError:ABORTED
+     *   RadioError:DEVICE_IN_USE
+     *   RadioError:INTERNAL_ERR
+     *   RadioError:NO_MEMORY
+     *   RadioError:MODEM_ERR
      */
     oneway getAvailableNetworksResponse(RadioResponseInfo info,
             vec<OperatorInfo> networkInfos);
diff --git a/radio/1.0/types.hal b/radio/1.0/types.hal
index 7c1d143..9b904a5 100644
--- a/radio/1.0/types.hal
+++ b/radio/1.0/types.hal
@@ -86,9 +86,11 @@
     SS_MODIFIED_TO_SS = 27,               // SS request modified to different SS request
     LCE_NOT_SUPPORTED = 36,               // LCE service not supported(36 in RILConstants.java)
     NO_MEMORY = 37,                       // Not sufficient memory to process the request
-    INTERNAL_ERR = 38,                    // Hit unexpected vendor internal error scenario
+    INTERNAL_ERR = 38,                    // Modem hit unexpected error scenario while handling
+                                          // this request
     SYSTEM_ERR = 39,                      // Hit platform or system error
-    MODEM_ERR = 40,                       // Hit unexpected modem error
+    MODEM_ERR = 40,                       // Vendor RIL got unexpected or incorrect response
+                                          // from modem for this request
     INVALID_STATE = 41,                   // Unexpected request for the current state
     NO_RESOURCES = 42,                    // Not sufficient resource to process the request
     SIM_ERR = 43,                         // Received error from SIM card