diff --git a/include/android/choreographer.h b/include/android/choreographer.h
index cd8e63d..f999708 100644
--- a/include/android/choreographer.h
+++ b/include/android/choreographer.h
@@ -219,12 +219,16 @@
  *
  * Note that this time should \b not be used to advance animation clocks.
  * Instead, see AChoreographerFrameCallbackData_getFrameTimelineExpectedPresentationTimeNanos().
+ *
+ * Available since API level 33.
  */
 int64_t AChoreographerFrameCallbackData_getFrameTimeNanos(
         const AChoreographerFrameCallbackData* data) __INTRODUCED_IN(33);
 
 /**
  * The number of possible frame timelines.
+ *
+ * Available since API level 33.
  */
 size_t AChoreographerFrameCallbackData_getFrameTimelinesLength(
         const AChoreographerFrameCallbackData* data) __INTRODUCED_IN(33);
@@ -233,15 +237,20 @@
  * Gets the index of the platform-preferred frame timeline.
  * The preferred frame timeline is the default
  * by which the platform scheduled the app, based on the device configuration.
+ *
+ * Available since API level 33.
  */
 size_t AChoreographerFrameCallbackData_getPreferredFrameTimelineIndex(
         const AChoreographerFrameCallbackData* data) __INTRODUCED_IN(33);
 
 /**
  * Gets the token used by the platform to identify the frame timeline at the given \c index.
+ * q
+ * Available since API level 33.
  *
  * \param index index of a frame timeline, in \f( [0, FrameTimelinesLength) \f). See
  * AChoreographerFrameCallbackData_getFrameTimelinesLength()
+ *
  */
 AVsyncId AChoreographerFrameCallbackData_getFrameTimelineVsyncId(
         const AChoreographerFrameCallbackData* data, size_t index) __INTRODUCED_IN(33);
@@ -250,6 +259,8 @@
  * Gets the time in nanoseconds at which the frame described at the given \c index is expected to
  * be presented. This time should be used to advance any animation clocks.
  *
+ * Available since API level 33.
+ *
  * \param index index of a frame timeline, in \f( [0, FrameTimelinesLength) \f). See
  * AChoreographerFrameCallbackData_getFrameTimelinesLength()
  */
@@ -260,6 +271,8 @@
  * Gets the time in nanoseconds at which the frame described at the given \c index needs to be
  * ready by in order to be presented on time.
  *
+ * Available since API level 33.
+ *
  * \param index index of a frame timeline, in \f( [0, FrameTimelinesLength) \f). See
  * AChoreographerFrameCallbackData_getFrameTimelinesLength()
  */
diff --git a/include/android/surface_control.h b/include/android/surface_control.h
index 79c59f2..e4926a6 100644
--- a/include/android/surface_control.h
+++ b/include/android/surface_control.h
@@ -524,6 +524,8 @@
  * Sets the desired extended range brightness for the layer. This only applies for layers whose
  * dataspace has RANGE_EXTENDED set on it.
  *
+ * Available since API level 34.
+ *
  * @param surface_control The layer whose extended range brightness is being specified
  * @param currentBufferRatio The current hdr/sdr ratio of the current buffer as represented as
  *                           peakHdrBrightnessInNits / targetSdrWhitePointInNits. For example if the
@@ -653,6 +655,8 @@
  * and pushing buffers earlier for server side queuing will be advantageous
  * in such cases.
  *
+ * Available since API level 31.
+ *
  * \param transaction The transaction in which to make the change.
  * \param surface_control The ASurfaceControl on which to control buffer backpressure behavior.
  * \param enableBackPressure Whether to enable back pressure.
@@ -674,6 +678,8 @@
  * AChoreographer_postVsyncCallback(). The \c vsyncId can then be extracted from the
  * callback payload using AChoreographerFrameCallbackData_getFrameTimelineVsyncId().
  *
+ * Available since API level 33.
+ *
  * \param vsyncId The vsync ID received from AChoreographer, setting the frame's presentation target
  * to the corresponding expected presentation time and deadline from the frame to be rendered. A
  * stale or invalid value will be ignored.