diff --git a/Python3.md b/Python3.md
index 5976a10..774b6b1 100644
--- a/Python3.md
+++ b/Python3.md
@@ -43,7 +43,7 @@ We use [tox](https://tox.readthedocs.io/en/latest/) to standardize environments
 | `interfaces` | done |  |
 | `introducer` | **doing** |  |
 | `monitor` | done |  |
-| `mutable`‡ | **todo** |  |
+| `mutable`‡ | **doing** | Itamar |
 | `node` | doing | Ross |
 | `nodemaker` | **todo** |  |
 | `scripts` | **todo** |  |