diff --git a/drm/1.4/types.hal b/drm/1.4/types.hal
index a4490a5..8cb27cd 100644
--- a/drm/1.4/types.hal
+++ b/drm/1.4/types.hal
@@ -32,8 +32,16 @@
 /**
  * Returned by getLogMessages to report error diagnostics to the
  * app.
+ *
+ * The |message| field is for informational purposes only, and
+ * NOT meant to be parsed programmatically when handling errors.
+ * For programmatic error handling, please check the return |Status|
+ * of APIs instead.
  */
 struct LogMessage {
+  /**
+   * Epoch time in milliseconds.
+   */
   int64_t timeMs;
   LogPriority priority;
   string message;
diff --git a/wifi/hostapd/1.3/IHostapdCallback.hal b/wifi/hostapd/1.3/IHostapdCallback.hal
index a098d87..3208366 100644
--- a/wifi/hostapd/1.3/IHostapdCallback.hal
+++ b/wifi/hostapd/1.3/IHostapdCallback.hal
@@ -35,12 +35,12 @@
      * The apIfaceInstance can be used to identify which instance the callback
      * is from.
      * Note: The apIfaceInstance must be same as ifaceName in single AP mode.
-     * @param freq The operational frequency of the AP.
+     * @param freqMhz The operational frequency of the AP in Mhz.
      * @param bandwidth The operational bandwidth of the AP.
      * @param generation The operational mode of the AP (e.g. 11ac, 11ax).
      * @param apIfaceInstanceMacAddress MAC Address of the apIfaceInstance.
      */
-    oneway onApInstanceInfoChanged(string ifaceName, string apIfaceInstance, uint32_t freq,
+    oneway onApInstanceInfoChanged(string ifaceName, string apIfaceInstance, uint32_t freqMhz,
         Bandwidth bandwidth, Generation generation, MacAddress apIfaceInstanceMacAddress);
 
     /**