diff --git a/Documentation/reference/user/07_signals.rst b/Documentation/reference/user/07_signals.rst
index b396905cfe..37ab6fabaa 100644
--- a/Documentation/reference/user/07_signals.rst
+++ b/Documentation/reference/user/07_signals.rst
@@ -277,7 +277,7 @@ provided by NuttX:
 
   If sigprocmask() fails, the signal mask of the task is not changed.
 
-  :param how: How the signal mast will be changed.
+  :param how: How the signal mask will be changed.
     - ``SIG_BLOCK`` The resulting set is the union of the current set and the signal set pointed to by the ``set`` input parameter.
     - ``SIG_UNBLOCK`` The resulting set is the intersection of the current set and the complement of the signal set pointed to by the ``set`` input parameter. 
     - ``SIG_SETMASK`` The resulting set is the signal set pointed to by the ``set`` input parameter.
diff --git a/Documentation/reference/user/08_pthread.rst b/Documentation/reference/user/08_pthread.rst
index ccab1e4da2..b2c3ece6b0 100644
--- a/Documentation/reference/user/08_pthread.rst
+++ b/Documentation/reference/user/08_pthread.rst
@@ -1689,7 +1689,7 @@ No support for the following pthread interfaces is provided by NuttX:
 
   **Input Parameters:**
 
-  -  ``how``. How the signal mast will be changed:
+  -  ``how``. How the signal mask will be changed:
 
      -  ``SIG_BLOCK``: The resulting set is the union of the current set
         and the signal set pointed to by ``set``.
diff --git a/include/nuttx/signal.h b/include/nuttx/signal.h
index cf078e69aa..bc57ab6b69 100644
--- a/include/nuttx/signal.h
+++ b/include/nuttx/signal.h
@@ -205,7 +205,7 @@ int nxsig_delset(FAR sigset_t *set, int signo);
  *   sigprocmask() except that it does not modify the errno value.
  *
  * Input Parameters:
- *   how - How the signal mast will be changed:
+ *   how - How the signal mask will be changed:
  *         SIG_BLOCK   - The resulting set is the union of the current set
  *                       and the signal set pointed to by 'set'.
  *         SIG_UNBLOCK - The resulting set is the intersection of the current
diff --git a/sched/pthread/pthread_sigmask.c b/sched/pthread/pthread_sigmask.c
index 891da589fe..7c6097a772 100644
--- a/sched/pthread/pthread_sigmask.c
+++ b/sched/pthread/pthread_sigmask.c
@@ -59,7 +59,7 @@
  *   information.
  *
  * Input Parameters:
- *   how - How the signal mast will be changed:
+ *   how - How the signal mask will be changed:
  *         SIG_BLOCK   - The resulting set is the union of
  *                       the current set and the signal set
  *                       pointed to by 'set'.
diff --git a/sched/signal/sig_procmask.c b/sched/signal/sig_procmask.c
index 204ec86af6..a0b9d41745 100644
--- a/sched/signal/sig_procmask.c
+++ b/sched/signal/sig_procmask.c
@@ -81,7 +81,7 @@
  *   sigprocmask() except that it does not modify the errno value.
  *
  * Input Parameters:
- *   how - How the signal mast will be changed:
+ *   how - How the signal mask will be changed:
  *         SIG_BLOCK   - The resulting set is the union of the current set
  *                       and the signal set pointed to by 'set'.
  *         SIG_UNBLOCK - The resulting set is the intersection of the current
@@ -186,7 +186,7 @@ int nxsig_procmask(int how, FAR const sigset_t *set, FAR sigset_t *oset)
  *   by this function call.
  *
  * Input Parameters:
- *   how - How the signal mast will be changed:
+ *   how - How the signal mask will be changed:
  *         SIG_BLOCK   - The resulting set is the union of the current set
  *                       and the signal set pointed to by 'set'.
  *         SIG_UNBLOCK - The resulting set is the intersection of the current