diff --git a/include/odp/api/spec/classification.h b/include/odp/api/spec/classification.h
index c10ee0addd..52091bbfbc 100644
--- a/include/odp/api/spec/classification.h
+++ b/include/odp/api/spec/classification.h
@@ -855,8 +855,8 @@ odp_queue_t odp_cls_hash_result(odp_cos_t cos, odp_packet_t packet);
  *
  * Before destroying a CoS, all the PMRs referring to the CoS (as a source or
  * destination CoS) must be destroyed first. Also, the CoS must not be in use
- * as the default CoS in any pktio (see odp_pktio_default_cos_set()) or as the
- * destination CoS of any IPsec SA.
+ * as the default or error CoS in any pktio (see odp_pktio_default_cos_set() and
+ * odp_pktio_error_cos_set()), or as the destination CoS of any IPsec SA.
  *
  * @param cos          CoS handle
  *
diff --git a/include/odp/api/spec/packet_io.h b/include/odp/api/spec/packet_io.h
index 6c70e3192b..97e5c44ac2 100644
--- a/include/odp/api/spec/packet_io.h
+++ b/include/odp/api/spec/packet_io.h
@@ -678,31 +678,40 @@ int odp_pktio_mac_addr_set(odp_pktio_t pktio, const void *mac_addr,
 			   int size);
 
 /**
- * Setup per-port default class-of-service.
+ * Setup interface default class-of-service
  *
- * @param pktio        Ingress port pktio handle.
- * @param default_cos  Class-of-service set to all packets arriving at this
- *                     ingress port. Use ODP_COS_INVALID to remove the default
- *                     CoS.
+ * Set default CoS for packets arriving from this packet IO interface, or remove
+ * the current default CoS by passing ODP_COS_INVALID as 'default_cos'. The
+ * 'default_cos' must be unique per odp_pktio_t instance. This function may be
+ * called multiple times on the same interface, and each successful call
+ * replaces the previous default CoS binding.
+ *
+ * @param pktio        Packet IO handle
+ * @param default_cos  CoS handle or ODP_COS_INVALID
  *
  * @retval  0 on success
  * @retval <0 on failure
- *
- * @note The default_cos has to be unique per odp_pktio_t instance.
  */
 int odp_pktio_default_cos_set(odp_pktio_t pktio, odp_cos_t default_cos);
 
 /**
- * Setup per-port error class-of-service
+ * Setup interface error class-of-service
  *
- * @param pktio      Ingress port pktio handle.
- * @param error_cos  class-of-service set to all packets arriving at this
- *                   ingress port that contain an error.
+ * Set CoS for packets arriving from this packet IO interface that contain
+ * errors detected during packet parsing, or remove the current error CoS by
+ * passing ODP_COS_INVALID as 'error_cos'. This function may be called multiple
+ * times on the same interface, and each successful call replaces the previous
+ * error CoS binding.
+ *
+ * When no error CoS is configured, it's implementation defined how packets with
+ * parsing errors are handled (they may be discarded similarly to classification
+ * failures).
+ *
+ * @param pktio      Packet IO handle
+ * @param error_cos  CoS handle or ODP_COS_INVALID
  *
  * @retval  0 on success
  * @retval <0 on failure
- *
- * @note Optional.
  */
 int odp_pktio_error_cos_set(odp_pktio_t pktio, odp_cos_t error_cos);