diff --git a/include/spdk/ioat.h b/include/spdk/ioat.h
index db5e9a007..8a1fdba2e 100644
--- a/include/spdk/ioat.h
+++ b/include/spdk/ioat.h
@@ -54,18 +54,27 @@ struct spdk_ioat_chan;
 
 /**
  * Signature for callback function invoked when a request is completed.
+ *
+ * \param arg User-specified opaque value corresponding to cb_arg from the request submission.
  */
 typedef void (*spdk_ioat_req_cb)(void *arg);
 
 /**
  * Callback for spdk_ioat_probe() enumeration.
  *
+ * \param cb_ctx User-specified opaque value corresponding to cb_ctx from spdk_ioat_probe().
+ * \param pci_dev PCI device that is being probed.
+ *
  * \return true to attach to this device.
  */
 typedef bool (*spdk_ioat_probe_cb)(void *cb_ctx, struct spdk_pci_device *pci_dev);
 
 /**
  * Callback for spdk_ioat_probe() to report a device that has been attached to the userspace I/OAT driver.
+ *
+ * \param cb_ctx User-specified opaque value corresponding to cb_ctx from spdk_ioat_probe().
+ * \param pci_dev PCI device that was attached to the driver.
+ * \param ioat I/OAT channel that was attached to the driver.
  */
 typedef void (*spdk_ioat_attach_cb)(void *cb_ctx, struct spdk_pci_device *pci_dev,
 				    struct spdk_ioat_chan *ioat);
@@ -74,6 +83,7 @@ typedef void (*spdk_ioat_attach_cb)(void *cb_ctx, struct spdk_pci_device *pci_de
  * \brief Enumerate the I/OAT devices attached to the system and attach the userspace I/OAT driver
  * to them if desired.
  *
+ * \param cb_ctx Opaque value which will be passed back in cb_ctx parameter of the callbacks.
  * \param probe_cb will be called once per I/OAT device found in the system.
  * \param attach_cb will be called for devices for which probe_cb returned true once the I/OAT
  * controller has been attached to the userspace driver.
@@ -88,11 +98,20 @@ int spdk_ioat_probe(void *cb_ctx, spdk_ioat_probe_cb probe_cb, spdk_ioat_attach_
 
 /**
  * Detaches specified device returned by \ref spdk_ioat_probe() from the I/OAT driver.
+ *
+ * \param ioat I/OAT channel to detach from the driver.
  */
 int spdk_ioat_detach(struct spdk_ioat_chan *ioat);
 
 /**
  * Submit a DMA engine memory copy request.
+ *
+ * \param chan I/OAT channel to submit request.
+ * \param cb_arg Opaque value which will be passed back as the arg parameter in the completion callback.
+ * \param cb_fn Callback function which will be called when the request is complete.
+ * \param dst Destination virtual address.
+ * \param src Source virtual address.
+ * \param nbytes Number of bytes to copy.
  */
 int64_t spdk_ioat_submit_copy(struct spdk_ioat_chan *chan,
 			      void *cb_arg, spdk_ioat_req_cb cb_fn,
@@ -100,6 +119,13 @@ int64_t spdk_ioat_submit_copy(struct spdk_ioat_chan *chan,
 
 /**
  * Submit a DMA engine memory fill request.
+ *
+ * \param chan I/OAT channel to submit request.
+ * \param cb_arg Opaque value which will be passed back as the cb_arg parameter in the completion callback.
+ * \param cb_fn Callback function which will be called when the request is complete.
+ * \param dst Destination virtual address.
+ * \param fill_pattern Repeating eight-byte pattern to use for memory fill.
+ * \param nbytes Number of bytes to fill.
  */
 int64_t spdk_ioat_submit_fill(struct spdk_ioat_chan *chan,
 			      void *cb_arg, spdk_ioat_req_cb cb_fn,
@@ -108,6 +134,8 @@ int64_t spdk_ioat_submit_fill(struct spdk_ioat_chan *chan,
 /**
  * Check for completed requests on an I/OAT channel.
  *
+ * \param chan I/OAT channel to check for completions.
+ *
  * \returns 0 on success or negative if something went wrong.
  */
 int spdk_ioat_process_events(struct spdk_ioat_chan *chan);
@@ -122,6 +150,10 @@ enum spdk_ioat_dma_capability_flags {
 
 /**
  * Get the DMA engine capabilities.
+ *
+ * \param chan I/OAT channel to query.
+ *
+ * \return A combination of flags from \ref spdk_ioat_dma_capability_flags.
  */
 uint32_t spdk_ioat_get_dma_capabilities(struct spdk_ioat_chan *chan);