diff --git a/CHANGELOG b/CHANGELOG
new file mode 100644
index 0000000..cdc4e74
--- /dev/null
+++ b/CHANGELOG
@@ -0,0 +1,9 @@
+V0.3:
+
+    * NtStatusException is now a WindowsError
+    * Add shr/shl RM32(64)/Imm8
+    * Small fix simple_x64 Imm8 encoding
+    * `execute_64bits_code_from_syswow` able to return ULONG64
+    * utils.get_short_path / utils.get_long_path
+    * Object returned by `windows.native_exec.create_function` has an attribute `code_addr` with the address of the executable code
+    * add `windows.winproxy.is_implemented` Ex: windows.winproxy.is_implemented(windows.winproxy.QueryWorkingSetEx)
\ No newline at end of file
diff --git a/windows/winproxy.py b/windows/winproxy.py
index 8c183e0..7fe6fbf 100644
--- a/windows/winproxy.py
+++ b/windows/winproxy.py
@@ -9,6 +9,13 @@ from windows.generated_def.ntstatus import NtStatusException
 from windows.dbgprint import dbgprint
 
 
+def is_implemented(winfunc):
+    try:
+        winfunc.force_resolution()
+    except ExportNotFound:
+        return False
+    return True
+
 class Kernel32Error(WindowsError):
     def __new__(cls, func_name):
         win_error = ctypes.WinError()
@@ -83,7 +90,7 @@ def error_ntstatus(func_name, result, func, args):
     return args
 
 
-class ExportNotFound(AttributeError):
+class ExportNotFound(RuntimeError):
         def __init__(self, func_name, api_name):
             self.func_name = func_name
             self.api_name = api_name