diff --git a/src/filesystem/implementation.js b/src/filesystem/implementation.js
index 38e5c67..852a95b 100644
--- a/src/filesystem/implementation.js
+++ b/src/filesystem/implementation.js
@@ -2400,43 +2400,51 @@ function ftruncate(context, fd, length, callback) {
 }
 
 module.exports = {
+  appendFile,
+  access,
+  chown,
+  chmod,
+  close,
+  // copyFile - https://github.com/filerjs/filer/issues/436
   ensureRootDirectory: ensure_root_directory,
-  open: open,
-  chmod: chmod,
-  access: access,
-  fchmod: fchmod,
-  chown: chown,
-  fchown: fchown,
-  close: close,
-  mknod: mknod,
-  mkdir: mkdir,
-  mkdtemp: mkdtemp,
-  rmdir: rmdir,
-  unlink: unlink,
-  stat: stat,
-  fstat: fstat,
-  link: link,
-  fsync: fsync,
-  read: read,
-  readFile: readFile,
-  write: write,
-  writeFile: writeFile,
-  appendFile: appendFile,
-  exists: exists,
-  getxattr: getxattr,
-  fgetxattr: fgetxattr,
-  setxattr: setxattr,
-  fsetxattr: fsetxattr,
-  removexattr: removexattr,
-  fremovexattr: fremovexattr,
-  lseek: lseek,
-  readdir: readdir,
-  utimes: utimes,
-  futimes: futimes,
-  rename: rename,
-  symlink: symlink,
-  readlink: readlink,
-  lstat: lstat,
-  truncate: truncate,
-  ftruncate: ftruncate
+  exists,
+  fchown,
+  fchmod,
+  // fdatasync - https://github.com/filerjs/filer/issues/653
+  fgetxattr,
+  fremovexattr,
+  fsetxattr,
+  fstat,
+  fsync,
+  ftruncate,
+  futimes,
+  getxattr,
+  // lchown - https://github.com/filerjs/filer/issues/620
+  // lchmod - https://github.com/filerjs/filer/issues/619
+  link,
+  lseek,
+  lstat,
+  mkdir,
+  mkdtemp,
+  mknod,
+  open,
+  readdir,
+  read,
+  readFile,
+  readlink,
+  // realpath - https://github.com/filerjs/filer/issues/85
+  removexattr,
+  rename,
+  rmdir,
+  setxattr,
+  stat,
+  symlink,
+  truncate,
+  // unwatchFile - implemented in interface.js
+  unlink,
+  utimes,
+  // watch - implemented in interface.js
+  // watchFile - implemented in interface.js
+  writeFile,
+  write
 };
diff --git a/src/filesystem/interface.js b/src/filesystem/interface.js
index 59f7563..c8b6d30 100644
--- a/src/filesystem/interface.js
+++ b/src/filesystem/interface.js
@@ -317,44 +317,52 @@ function FileSystem(options, callback) {
    * can be processed and validated before being passed on to the method.
    */
   [
-    { name: 'open', promises: true, absPathArgs: [ 0 ] },
+    { name: 'appendFile', promises: true, absPathArgs: [ 0 ] },
     { name: 'access', promises: true, absPathArgs: [ 0 ] },
-    { name: 'chmod', promises: true, absPathArgs: [ 0 ] },
-    { name: 'fchmod' },
     { name: 'chown', promises: true, absPathArgs: [ 0 ] },
-    { name: 'fchown' },
+    { name: 'chmod', promises: true, absPathArgs: [ 0 ] },
     { name: 'close' },
-    { name: 'mknod', promises: true, absPathArgs: [ 0 ] },
-    { name: 'mkdir', promises: true, absPathArgs: [ 0 ] },
-    { name: 'mkdtemp', promises: true },
-    { name: 'rmdir', promises: true, absPathArgs: [ 0 ] },
-    { name: 'stat', promises: true, absPathArgs: [ 0 ] },
+    // copyFile - https://github.com/filerjs/filer/issues/436
+    { name: 'exists', absPathArgs: [ 0 ] },
+    { name: 'fchown' },
+    { name: 'fchmod' },
+    // fdatasync - https://github.com/filerjs/filer/issues/653
+    { name: 'fgetxattr' },
+    { name: 'fremovexattr' },
+    { name: 'fsetxattr' },
     { name: 'fstat' },
     { name: 'fsync' },
+    { name: 'ftruncate' },
+    { name: 'futimes' },
+    { name: 'getxattr', promises: true, absPathArgs: [ 0 ] },
+    // lchown - https://github.com/filerjs/filer/issues/620
+    // lchmod - https://github.com/filerjs/filer/issues/619
     { name: 'link', promises: true, absPathArgs: [0, 1] },
-    { name: 'unlink', promises: true, absPathArgs: [ 0 ] },
+    { name: 'lseek' },
+    { name: 'lstat', promises: true },
+    { name: 'mkdir', promises: true, absPathArgs: [ 0 ] },
+    { name: 'mkdtemp', promises: true },
+    { name: 'mknod', promises: true, absPathArgs: [ 0 ] },
+    { name: 'open', promises: true, absPathArgs: [ 0 ] },
+    { name: 'readdir', promises: true, absPathArgs: [ 0 ] },
     { name: 'read' },
     { name: 'readFile', promises: true, absPathArgs: [ 0 ] },
-    { name: 'write' },
-    { name: 'writeFile', promises: true, absPathArgs: [ 0 ] },
-    { name: 'appendFile', promises: true, absPathArgs: [ 0 ] },
-    { name: 'exists', absPathArgs: [ 0 ] },
-    { name: 'lseek' },
-    { name: 'readdir', promises: true, absPathArgs: [ 0 ] },
-    { name: 'rename', promises: true, absPathArgs: [0, 1] },
     { name: 'readlink', promises: true, absPathArgs: [ 0 ] },
-    { name: 'symlink', promises: true, relPathPargs: [ 0 ], absPathArgs: [ 1 ] },
-    { name: 'lstat', promises: true },
-    { name: 'truncate', promises: true, absPathArgs: [ 0 ] },
-    { name: 'ftruncate' },
-    { name: 'utimes', promises: true, absPathArgs: [ 0 ] },
-    { name: 'futimes' },
-    { name: 'setxattr', promises: true, absPathArgs: [ 0 ] },
-    { name: 'getxattr', promises: true, absPathArgs: [ 0 ] },
-    { name: 'fsetxattr' },
-    { name: 'fgetxattr' },
+    // realpath - https://github.com/filerjs/filer/issues/85
     { name: 'removexattr', promises: true, absPathArgs: [ 0 ] },
-    { name: 'fremovexattr' }
+    { name: 'rename', promises: true, absPathArgs: [0, 1] },
+    { name: 'rmdir', promises: true, absPathArgs: [ 0 ] },
+    { name: 'setxattr', promises: true, absPathArgs: [ 0 ] },
+    { name: 'stat', promises: true, absPathArgs: [ 0 ] },
+    { name: 'symlink', promises: true, relPathArgs: [ 0 ], absPathArgs: [ 1 ] },
+    { name: 'truncate', promises: true, absPathArgs: [ 0 ] },
+    // unwatchFile - https://github.com/filerjs/filer/pull/553
+    { name: 'unlink', promises: true, absPathArgs: [ 0 ] },
+    { name: 'utimes', promises: true, absPathArgs: [ 0 ] },
+    // watch - implemented above in `this.watch`
+    // watchFile - https://github.com/filerjs/filer/issues/654
+    { name: 'writeFile', promises: true, absPathArgs: [ 0 ] },
+    { name: 'write' }
   ].forEach(function(method) {
     var methodName = method.name;
     var shouldPromisify = method.promises === true;
@@ -373,8 +381,8 @@ function FileSystem(options, callback) {
       if(method.absPathArgs) {
         method.absPathArgs.forEach(pathArg => processPathArg(args, pathArg, false));
       }
-      if(method.relPathPargs) {
-        method.relPathPargs.forEach(pathArg => processPathArg(args, pathArg, true));
+      if(method.relPathArgs) {
+        method.relPathArgs.forEach(pathArg => processPathArg(args, pathArg, true));
       }
 
       var error = fs.queueOrRun(function() {