diff --git a/include/syslog.h b/include/syslog.h
index 6c1316a7e61..efc62ac599d 100644
--- a/include/syslog.h
+++ b/include/syslog.h
@@ -128,14 +128,6 @@
 #define LOG_UPTO(p)   ((1 << (p)) - 1)
 #define LOG_ALL       0xff
 
-/****************************************************************************
- * Public Type Declarations
- ****************************************************************************/
-
-/****************************************************************************
- * Public Data
- ****************************************************************************/
-
 /****************************************************************************
  * Public Function Prototypes
  ****************************************************************************/
@@ -225,8 +217,12 @@ int lowvsyslog(int priority, FAR const IPTR char *format, va_list ap);
  *   to a priority p is LOG_MASK(p); LOG_UPTO(p) provides the mask of all
  *   priorities in the above list up to and including p.
  *
+ *   Per OpenGroup.org "If the maskpri argument is 0, the current log mask
+ *   is not modified."  In this implementation, the value zero is permitted
+ *   in order to disable all syslog levels.
+ *
  *   REVISIT: Per POSIX the syslog mask should be a per-process value but in
- *   NuttX, the scope of the mask is dependent on the nature of the build.
+ *   NuttX, the scope of the mask is dependent on the nature of the build:
  *
  *   Flat Build:  There is one, global SYSLOG mask that controls all output.
  *   Protected Build:  There are two SYSLOG masks.  One within the kernel
diff --git a/libc/syslog/lib_setlogmask.c b/libc/syslog/lib_setlogmask.c
index 84352411bd9..1d91d405558 100644
--- a/libc/syslog/lib_setlogmask.c
+++ b/libc/syslog/lib_setlogmask.c
@@ -70,8 +70,12 @@ uint8_t g_syslog_mask = LOG_ALL;
  *   to a priority p is LOG_MASK(p); LOG_UPTO(p) provides the mask of all
  *   priorities in the above list up to and including p.
  *
+ *   Per OpenGroup.org "If the maskpri argument is 0, the current log mask
+ *   is not modified."  In this implementation, the value zero is permitted
+ *   in order to disable all syslog levels.
+ *
  *   REVISIT: Per POSIX the syslog mask should be a per-process value but in
- *   NuttX, the scope of the mask is dependent on the nature of the build.
+ *   NuttX, the scope of the mask is dependent on the nature of the build:
  *
  *   Flat Build:  There is one, global SYSLOG mask that controls all output.
  *   Protected Build:  There are two SYSLOG masks.  One within the kernel