diff --git a/sys/include/saul_reg.h b/sys/include/saul_reg.h
index 624e1db1b3..ec2ae81588 100644
--- a/sys/include/saul_reg.h
+++ b/sys/include/saul_reg.h
@@ -72,6 +72,16 @@ int saul_reg_add(saul_reg_t *dev);
 /**
  * @brief   Unregister a device from the SAUL registry
  *
+ * @warning   Removing the device at runtime can send applications that have
+ *            looked up that device into invalid states, and should thus be
+ *            avoided.
+ *
+ * @warning   This function must only be used by drivers that advise developers
+ *            using them on how to prevent race conditions when using SAUL.
+ *
+ * @deprecated This function will be removed soon as it is practically unusable
+ *             for the above reasons.
+ *
  * @param[in] dev       pointer to a registry entry
  *
  * @return      0 on success