diff --git a/gst-libs/gst/audio/gstaudiodecoder.h b/gst-libs/gst/audio/gstaudiodecoder.h
index 90d3d0582c..27e1fab6b2 100644
--- a/gst-libs/gst/audio/gstaudiodecoder.h
+++ b/gst-libs/gst/audio/gstaudiodecoder.h
@@ -215,12 +215,18 @@ struct _GstAudioDecoder
  *                  Allows closing external resources.
  * @negotiate:      Optional.
  *                  Negotiate with downstream and configure buffer pools, etc.
+ *                  Subclasses should chain up to the parent implementation to
+ *                  invoke the default handler.
  * @decide_allocation: Optional.
  *                     Setup the allocation parameters for allocating output
  *                     buffers. The passed in query contains the result of the
  *                     downstream allocation query.
+ *                     Subclasses should chain up to the parent implementation to
+ *                     invoke the default handler.
  * @propose_allocation: Optional.
  *                      Propose buffer allocation parameters for upstream elements.
+ *                      Subclasses should chain up to the parent implementation to
+ *                      invoke the default handler.
  *
  * Subclasses can override any of the available virtual methods or not, as
  * needed. At minimum @handle_frame (and likely @set_format) needs to be
diff --git a/gst-libs/gst/audio/gstaudioencoder.h b/gst-libs/gst/audio/gstaudioencoder.h
index d989bf974e..e4973affe4 100644
--- a/gst-libs/gst/audio/gstaudioencoder.h
+++ b/gst-libs/gst/audio/gstaudioencoder.h
@@ -159,12 +159,18 @@ struct _GstAudioEncoder {
  *                  Allows closing external resources.
  * @negotiate:      Optional.
  *                  Negotiate with downstream and configure buffer pools, etc.
+ *                  Subclasses should chain up to the parent implementation to
+ *                  invoke the default handler.
  * @decide_allocation: Optional.
  *                     Setup the allocation parameters for allocating output
  *                     buffers. The passed in query contains the result of the
  *                     downstream allocation query.
+ *                     Subclasses should chain up to the parent implementation to
+ *                     invoke the default handler.
  * @propose_allocation: Optional.
  *                      Propose buffer allocation parameters for upstream elements.
+ *                      Subclasses should chain up to the parent implementation to
+ *                      invoke the default handler.
  *
  * Subclasses can override any of the available virtual methods or not, as
  * needed. At minimum @set_format and @handle_frame needs to be overridden.
diff --git a/gst-libs/gst/video/gstvideodecoder.h b/gst-libs/gst/video/gstvideodecoder.h
index 26dd86d992..56b0f1d914 100644
--- a/gst-libs/gst/video/gstvideodecoder.h
+++ b/gst-libs/gst/video/gstvideodecoder.h
@@ -219,18 +219,28 @@ struct _GstVideoDecoder
  *                  Event handler on the sink pad. This function should return
  *                  TRUE if the event was handled and should be discarded
  *                  (i.e. not unref'ed).
+ *                  Subclasses should chain up to the parent implementation to
+ *                  invoke the default handler.
  * @src_event:      Optional.
  *                  Event handler on the source pad. This function should return
  *                  TRUE if the event was handled and should be discarded
  *                  (i.e. not unref'ed).
+ *                  Subclasses should chain up to the parent implementation to
+ *                  invoke the default handler.
  * @negotiate:      Optional.
  *                  Negotiate with downstream and configure buffer pools, etc.
+ *                  Subclasses should chain up to the parent implementation to
+ *                  invoke the default handler.
  * @decide_allocation: Optional.
  *                     Setup the allocation parameters for allocating output
  *                     buffers. The passed in query contains the result of the
  *                     downstream allocation query.
+ *                     Subclasses should chain up to the parent implementation to
+ *                     invoke the default handler.
  * @propose_allocation: Optional.
  *                      Propose buffer allocation parameters for upstream elements.
+ *                      Subclasses should chain up to the parent implementation to
+ *                      invoke the default handler.
  *
  * Subclasses can override any of the available virtual methods or not, as
  * needed. At minimum @handle_frame needs to be overridden, and @set_format
diff --git a/gst-libs/gst/video/gstvideoencoder.h b/gst-libs/gst/video/gstvideoencoder.h
index ca9c9cf7a0..da4203652c 100644
--- a/gst-libs/gst/video/gstvideoencoder.h
+++ b/gst-libs/gst/video/gstvideoencoder.h
@@ -188,18 +188,28 @@ struct _GstVideoEncoder
  *                  Event handler on the sink pad. This function should return
  *                  TRUE if the event was handled and should be discarded
  *                  (i.e. not unref'ed).
+ *                  Subclasses should chain up to the parent implementation to
+ *                  invoke the default handler.
  * @src_event:      Optional.
  *                  Event handler on the source pad. This function should return
  *                  TRUE if the event was handled and should be discarded
  *                  (i.e. not unref'ed).
+ *                  Subclasses should chain up to the parent implementation to
+ *                  invoke the default handler.
  * @negotiate:      Optional.
  *                  Negotiate with downstream and configure buffer pools, etc.
+ *                  Subclasses should chain up to the parent implementation to
+ *                  invoke the default handler.
  * @decide_allocation: Optional.
  *                     Setup the allocation parameters for allocating output
  *                     buffers. The passed in query contains the result of the
  *                     downstream allocation query.
+ *                     Subclasses should chain up to the parent implementation to
+ *                     invoke the default handler.
  * @propose_allocation: Optional.
  *                      Propose buffer allocation parameters for upstream elements.
+ *                      Subclasses should chain up to the parent implementation to
+ *                      invoke the default handler.
  *
  * Subclasses can override any of the available virtual methods or not, as
  * needed. At minimum @handle_frame needs to be overridden, and @set_format