diff --git a/configs/README.txt b/configs/README.txt
index 88b3689079..50208f210c 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -503,6 +503,13 @@ defconfig -- This is a configuration file similar to the Linux
 		CONFIG_NAME_MAX - The maximum size of a file name.
 		CONFIG_STDIO_BUFFER_SIZE - Size of the buffer to allocate
 		  on fopen. (Only if CONFIG_NFILE_STREAMS > 0)
+		CONFIG_STDIO_LINEBUFFER - If standard C buffered I/O is enabled
+		  (CONFIG_STDIO_BUFFER_SIZE > 0), then this option may be added
+		  to force automatic, line-oriented flushing the output buffer
+		  for printf() fprintf(), and vfprintf().  When a newline is
+		  encountered in the format string, the output buffer will be
+		  flushed.  This (slightly) increases the NuttX footprint but
+ 		  supports the kind of behavior that people expect for printf.
 		CONFIG_NUNGET_CHARS - Number of characters that can be
 		  buffered by ungetc() (Only if CONFIG_NFILE_STREAMS > 0)
 		CONFIG_PREALLOC_MQ_MSGS - The number of pre-allocated message