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-rw-r--r--doc/api/fs.markdown4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/api/fs.markdown b/doc/api/fs.markdown
index 178187a282..79a989e012 100644
--- a/doc/api/fs.markdown
+++ b/doc/api/fs.markdown
@@ -277,6 +277,10 @@ this doesn't turn `fs.open()` into a synchronous blocking call, if that's what
you want then you should be using `fs.openSync()`
An exception occurs if the file does not exist.
+* `'rs+'` - Open file for reading and writing, telling the OS to open it
+synchronously.
+See notes for `'rs'` about using this with caution.
+
* `'w'` - Open file for writing.
The file is created (if it does not exist) or truncated (if it exists).