diff --git a/audio/effect/2.0/IDownmixEffect.hal b/audio/effect/2.0/IDownmixEffect.hal
index 06409a3..1232095 100644
--- a/audio/effect/2.0/IDownmixEffect.hal
+++ b/audio/effect/2.0/IDownmixEffect.hal
@@ -25,7 +25,13 @@
         FOLD   // mix the extra channels with FL/FR
     };
 
+    /**
+     * Sets the current downmix preset.
+     */
     setType(Type preset) generates (Result retval);
 
+    /**
+     * Gets the current downmix preset.
+     */
     getType() generates (Result retval, Type preset);
 };
diff --git a/audio/effect/2.0/IEnvironmentalReverbEffect.hal b/audio/effect/2.0/IEnvironmentalReverbEffect.hal
index dca89f9..58d6d97 100644
--- a/audio/effect/2.0/IEnvironmentalReverbEffect.hal
+++ b/audio/effect/2.0/IEnvironmentalReverbEffect.hal
@@ -64,12 +64,12 @@
     getRoomLevel() generates (Result retval, int16_t roomLevel);
 
     /**
-     * Sets the room high frequences level.
+     * Sets the room high frequencies level.
      */
     setRoomHfLevel(int16_t roomHfLevel) generates (Result retval);
 
     /**
-     * Gets the room high frequences level.
+     * Gets the room high frequencies level.
      */
     getRoomHfLevel() generates (Result retval, int16_t roomHfLevel);
 
@@ -84,12 +84,12 @@
     getDecayTime() generates (Result retval, uint32_t decayTime);
 
     /**
-     * Sets the ratio of high frequences decay.
+     * Sets the ratio of high frequencies decay.
      */
     setDecayHfRatio(int16_t decayHfRatio) generates (Result retval);
 
     /**
-     * Gets the ratio of high frequences decay.
+     * Gets the ratio of high frequencies decay.
      */
     getDecayHfRatio() generates (Result retval, int16_t decayHfRatio);
 
diff --git a/audio/effect/2.0/IPresetReverbEffect.hal b/audio/effect/2.0/IPresetReverbEffect.hal
index 2237bc4..f37e56a 100644
--- a/audio/effect/2.0/IPresetReverbEffect.hal
+++ b/audio/effect/2.0/IPresetReverbEffect.hal
@@ -31,7 +31,13 @@
         LAST = PLATE
     };
 
+    /**
+     * Sets the current preset.
+     */
     setPreset(Preset preset) generates (Result retval);
 
+    /**
+     * Gets the current preset.
+     */
     getPreset() generates (Result retval, Preset preset);
 };
diff --git a/audio/effect/2.0/IVisualizerEffect.hal b/audio/effect/2.0/IVisualizerEffect.hal
index fd3edbd..fffc70b 100644
--- a/audio/effect/2.0/IVisualizerEffect.hal
+++ b/audio/effect/2.0/IVisualizerEffect.hal
@@ -100,7 +100,7 @@
         } value;
     };
     /**
-     * Retrieves the lastest measurements. The measurements to be made
+     * Retrieves the latest measurements. The measurements to be made
      * are specified by 'setMeasurementMode' parameter.
      *
      * @return retval operation completion status.