diff --git a/include/nuttx/mutex.h b/include/nuttx/mutex.h
index 3784d1715a2..bd870c071d0 100644
--- a/include/nuttx/mutex.h
+++ b/include/nuttx/mutex.h
@@ -110,8 +110,7 @@ void nxmutex_add_backtrace(FAR mutex_t *mutex);
  *
  * Return Value:
  *   This is an internal OS interface and should not be used by applications.
- *   It follows the NuttX internal error return policy:  Zero (OK) is
- *   returned on success.  A negated errno value is returned on failure.
+ *   Zero (OK) is always returned.
  *
  ****************************************************************************/
 
@@ -471,8 +470,7 @@ static inline_function bool nxmutex_is_locked(FAR mutex_t *mutex)
  *
  * Return Value:
  *   This is an internal OS interface and should not be used by applications.
- *   It follows the NuttX internal error return policy:  Zero (OK) is
- *   returned on success.  A negated errno value is returned on failure.
+ *   Zero (OK) is always returned.
  *
  ****************************************************************************/
 
@@ -735,8 +733,7 @@ static inline_function int nxmutex_setprioceiling(FAR mutex_t *mutex,
  *
  * Return Value:
  *   This is an internal OS interface and should not be used by applications.
- *   It follows the NuttX internal error return policy:  Zero (OK) is
- *   returned on success.  A negated errno value is returned on failure.
+ *   Zero (OK) is always returned.
  *
  ****************************************************************************/
 
@@ -757,8 +754,7 @@ static inline_function int nxrmutex_init(FAR rmutex_t *rmutex)
  *
  * Return Value:
  *   This is an internal OS interface and should not be used by applications.
- *   It follows the NuttX internal error return policy:  Zero (OK) is
- *   returned on success.  A negated errno value is returned on failure.
+ *   Zero (OK) is always returned.
  *
  ****************************************************************************/
 
diff --git a/include/nuttx/semaphore.h b/include/nuttx/semaphore.h
index 4178a51b474..753186712d2 100644
--- a/include/nuttx/semaphore.h
+++ b/include/nuttx/semaphore.h
@@ -158,8 +158,7 @@ extern "C"
  *
  * Returned Value:
  *   This is an internal OS interface and should not be used by applications.
- *   It follows the NuttX internal error return policy:  Zero (OK) is
- *   returned on success.  A negated errno value is returned on failure.
+ *   Zero (OK) is always returned.
  *
  ****************************************************************************/
 
@@ -184,8 +183,7 @@ int nxsem_init(FAR sem_t *sem, int pshared, int32_t value);
  *
  * Returned Value:
  *   This is an internal OS interface and should not be used by applications.
- *   It follows the NuttX internal error return policy:  Zero (OK) is
- *   returned on success.  A negated errno value is returned on failure.
+ *   Zero (OK) is always returned.
  *
  ****************************************************************************/
 
diff --git a/libs/libc/misc/lib_mutex.c b/libs/libc/misc/lib_mutex.c
index 37e5a06c60d..32bbe029ff8 100644
--- a/libs/libc/misc/lib_mutex.c
+++ b/libs/libc/misc/lib_mutex.c
@@ -77,8 +77,7 @@ void nxmutex_add_backtrace(FAR mutex_t *mutex)
  *
  * Return Value:
  *   This is an internal OS interface and should not be used by applications.
- *   It follows the NuttX internal error return policy:  Zero (OK) is
- *   returned on success.  A negated errno value is returned on failure.
+ *   Zero (OK) is always returned.
  *
  ****************************************************************************/
 
diff --git a/libs/libc/semaphore/sem_init.c b/libs/libc/semaphore/sem_init.c
index 89d100758d0..544ccde87c6 100644
--- a/libs/libc/semaphore/sem_init.c
+++ b/libs/libc/semaphore/sem_init.c
@@ -57,8 +57,7 @@
  *
  * Returned Value:
  *   This is an internal OS interface and should not be used by applications.
- *   It follows the NuttX internal error return policy:  Zero (OK) is
- *   returned on success.  A negated errno value is returned on failure.
+ *   Zero (OK) is always returned.
  *
  ****************************************************************************/
 
diff --git a/sched/semaphore/sem_destroy.c b/sched/semaphore/sem_destroy.c
index 0bb84b8c7ad..ad16acf4545 100644
--- a/sched/semaphore/sem_destroy.c
+++ b/sched/semaphore/sem_destroy.c
@@ -53,8 +53,7 @@
  *
  * Returned Value:
  *   This is an internal OS interface and should not be used by applications.
- *   It follows the NuttX internal error return policy:  Zero (OK) is
- *   returned on success.  A negated errno value is returned on failure.
+ *   Zero (OK) is always returned.
  *
  ****************************************************************************/