doc: document the cache parameter for fs.realpathSync

PR-URL: #4285 Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: James M Snell <[email protected]>
nodejs · Dec 16, 2015 · a8854e5 · a8854e5
1 parent 2859f9e
commit a8854e5
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/doc/api/fs.markdown b/doc/api/fs.markdown
@@ -634,7 +634,9 @@ Synchronous version of [`fs.read()`][]. Returns the number of `bytesRead`.
 
 ## fs.realpathSync(path[, cache])
 
-Synchronous realpath(2). Returns the resolved path.
+Synchronous realpath(2). Returns the resolved path. `cache` is an
+object literal of mapped paths that can be used to force a specific path
+resolution or avoid additional `fs.stat` calls for known real paths.
 
 ## fs.rename(oldPath, newPath, callback)