diff --git a/attmap/_version.py b/attmap/_version.py
index 8e377d6..8e2394f 100644
--- a/attmap/_version.py
+++ b/attmap/_version.py
@@ -1 +1 @@
-__version__ = "0.12.5"
+__version__ = "0.12.6"
diff --git a/attmap/attmap.py b/attmap/attmap.py
index 2ee7706..1edc05e 100644
--- a/attmap/attmap.py
+++ b/attmap/attmap.py
@@ -43,7 +43,7 @@ def __setitem__(self, key, value, finalize=True):
         """
         # TODO: consider enforcement of type constraint, that value of different
         # type may not overwrite existing.
-        self.__dict__[key] = self._final_for_store(value)
+        self.__dict__[key] = self._final_for_store(key, value)
 
     def __eq__(self, other):
         # TODO: check for equality across classes?
@@ -80,10 +80,11 @@ def same_type(obj1, obj2, typenames=None):
             # have nonidentical labels.
             return False
 
-    def _final_for_store(self, v):
+    def _final_for_store(self, k, v):
         """
         Before storing a value, apply any desired transformation.
 
+        :param hashable k: key for which to store value
         :param object v: value to potentially transform before storing
         :return object: finalized value
         """
diff --git a/attmap/ordattmap.py b/attmap/ordattmap.py
index f2f9523..ddc636f 100644
--- a/attmap/ordattmap.py
+++ b/attmap/ordattmap.py
@@ -41,7 +41,7 @@ def __getitem__(self, item):
 
     def __setitem__(self, key, value):
         """ Support hook for value transformation before storage. """
-        super(OrdAttMap, self).__setitem__(key, self._final_for_store(value))
+        super(OrdAttMap, self).__setitem__(key, self._final_for_store(key, value))
 
     def __delitem__(self, key):
         """ Make unmapped key deletion unexceptional. """
diff --git a/docs/changelog.md b/docs/changelog.md
index fc4ce49..d4b940a 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## [0.12.6] - 2019-06-24
+### Added
+- Hook in value storage finalization for use of the key, not just the value
+
 ## [0.12.5] - 2019-06-06
 ### Changed
 - By default, represent empty `Mapping` value as `null` in YAML rendition.