diff --git a/tiramisu/option/dynsymlinkoption.py b/tiramisu/option/dynsymlinkoption.py
index 9dbc957..d2ae0c7 100644
--- a/tiramisu/option/dynsymlinkoption.py
+++ b/tiramisu/option/dynsymlinkoption.py
@@ -29,7 +29,7 @@ class DynSymLinkOption(object):
     def __init__(self,
                  opt,
                  rootpath,
-                 suffix):
+                 suffix) -> None:
         self._opt = opt
         self._rootpath = rootpath
         self._suffix = suffix
diff --git a/tiramisu/option/symlinkoption.py b/tiramisu/option/symlinkoption.py
index 869b64d..8476afa 100644
--- a/tiramisu/option/symlinkoption.py
+++ b/tiramisu/option/symlinkoption.py
@@ -18,6 +18,7 @@
 # the rough pypy's guys: http://codespeak.net/svn/pypy/dist/pypy/config/
 # the whole pypy projet is under MIT licence
 # ____________________________________________________________
+from typing import Any
 from .baseoption import BaseOption
 from ..i18n import _
 
@@ -39,26 +40,21 @@ class SymLinkOption(BaseOption):
         opt._add_dependency(self)
 
     def __getattr__(self,
-                    name):
-        if name == '_path':
-            return
+                    name: str) -> Any:
         return getattr(self._opt, name)
 
     def impl_has_dependency(self,
-                            self_is_dep=True):
+                            self_is_dep: bool=True) -> bool:
         """If self_is_dep is True, it has dependency (self._opt), so return True
         if self_is_dep is False, cannot has validation or callback, so return False
         """
-        return self_is_dep is True
+        return self_is_dep
 
-    def impl_is_symlinkoption(self):
+    def impl_is_symlinkoption(self) -> bool:
         return True
 
-    def impl_getopt(self):
+    def impl_getopt(self) -> BaseOption:
         return self._opt
 
-    def impl_is_readonly(self):
-        return self._path is not None
-
-    def get_consistencies(self):
+    def get_consistencies(self) -> tuple:
         return ()