diff --git a/docs/fileSync.md b/docs/fileSync.md
index 380982d..da5d906 100644
--- a/docs/fileSync.md
+++ b/docs/fileSync.md
@@ -12,7 +12,7 @@ The sync file appender writes log events to a file, the only difference to the n
 
 Any other configuration parameters will be passed to the underlying node.js core stream implementation:
 * `encoding` - `string` (default "utf-8")
-* `mode`- `integer` (default 0600)
+* `mode`- `integer` (default 0o600 - [node.js file modes](https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_file_modes))
 * `flags` - `string` (default 'a')
 
 ## Example
diff --git a/types/log4js.d.ts b/types/log4js.d.ts
index b7946da..51873b4 100644
--- a/types/log4js.d.ts
+++ b/types/log4js.d.ts
@@ -178,7 +178,7 @@ export interface DateFileAppender {
   pattern?: string;
   // default “utf-8”
   encoding?: string;
-  // default 0644
+  // default 0600
   mode?: number;
   // default ‘a’
   flags?: string;