Index: kernel/generic/src/ipc/ipc.c
===================================================================
--- kernel/generic/src/ipc/ipc.c	(revision a1026daf544b91d3c8e6d81817113aece3c7440e)
+++ kernel/generic/src/ipc/ipc.c	(revision 172813441a9fac99c6e9e697c38ae267f65d9c3a)
@@ -205,5 +205,5 @@
  * @param request Call structure with request.
  *
- * @return EOK on success or a negative error code.
+ * @return EOK on success or an error code.
  *
  */
Index: kernel/generic/src/ipc/ipcrsc.c
===================================================================
--- kernel/generic/src/ipc/ipcrsc.c	(revision a1026daf544b91d3c8e6d81817113aece3c7440e)
+++ kernel/generic/src/ipc/ipcrsc.c	(revision 172813441a9fac99c6e9e697c38ae267f65d9c3a)
@@ -168,5 +168,5 @@
  * @param[out] out_handle  New phone capability handle.
  *
- * @return  Negative error code if a new capability cannot be allocated.
+ * @return  An error code if a new capability cannot be allocated.
  */
 int phone_alloc(task_t *task, cap_handle_t *out_handle)
Index: kernel/generic/src/ipc/irq.c
===================================================================
--- kernel/generic/src/ipc/irq.c	(revision a1026daf544b91d3c8e6d81817113aece3c7440e)
+++ kernel/generic/src/ipc/irq.c	(revision 172813441a9fac99c6e9e697c38ae267f65d9c3a)
@@ -387,5 +387,5 @@
  * @param handle  IRQ capability handle.
  *
- * @return EOK on success or a negative error code.
+ * @return EOK on success or an error code.
  *
  */
Index: kernel/generic/src/ipc/sysipc.c
===================================================================
--- kernel/generic/src/ipc/sysipc.c	(revision a1026daf544b91d3c8e6d81817113aece3c7440e)
+++ kernel/generic/src/ipc/sysipc.c	(revision 172813441a9fac99c6e9e697c38ae267f65d9c3a)
@@ -155,5 +155,5 @@
  * @param olddata Saved data of the request.
  *
- * @return Return EOK on success or a negative error code.
+ * @return Return EOK on success or an error code.
  *
  */
@@ -359,5 +359,5 @@
  *
  * @return EOK on success.
- * @return Negative error code on error.
+ * @return An error code on error.
  *
  */
@@ -740,5 +740,5 @@
  *                 for explanation.
  *
- * @return Negative error code on error.
+ * @return An error code on error.
  */
 sysarg_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec,