diff --git a/index.src.html b/index.src.html
index 847d17b5..448ac303 100644
--- a/index.src.html
+++ b/index.src.html
@@ -741,7 +741,8 @@
         3. If needed, assign {{VideoDecoder/[[codec implementation]]}} with an
             implementation supporting |config|.
         4. Configure {{VideoDecoder/[[codec implementation]]}} with |config|.
-        5. [=queue a task=] to run the following steps:
+        5. Assign |config| to {{VideoDecoder/[[active decoder config]]}}.
+        6. [=queue a task=] to run the following steps:
             1. Assign `false` to {{VideoDecoder/[[message queue blocked]]}}.
             2. [=Queue a task=] to [=Process the control message queue=].
     3. Return `"processed"`.
@@ -921,7 +922,10 @@
 
         5. If {{VideoDecoderConfig/colorSpace}} [=map/exists=] in the
             {{VideoDecoder/[[active decoder config]]}}, assign its value to
-            |colorSpace|.
+            |colorSpace|. In that case, User Agents MAY replace `null` members
+            of |colorSpace| with the corresponding values detected by the codec
+            implementation.
+            FIXME: Properly specify the case of `null` members.
         6. Assign the values of {{VideoDecoderConfig/rotation}} and
             {{VideoDecoderConfig/flip}} to |rotation| and |flip| respectively.
         7. Let |frame| be the result of running the [=Create a VideoFrame=]
@@ -1100,7 +1104,8 @@
         3. If needed, assign {{AudioEncoder/[[codec implementation]]}} with an
             implementation supporting |config|.
         4. Configure {{AudioEncoder/[[codec implementation]]}} with |config|.
-        5. [=queue a task=] to run the following steps:
+        5. Assign |config| to {{AudioEncoder/[[active encoder config]]}}.
+        6. [=queue a task=] to run the following steps:
             1. Assign `false` to {{AudioEncoder/[[message queue blocked]]}}.
             2. [=Queue a task=] to [=Process the control message queue=].
     3. Return `"processed"`.
@@ -1481,7 +1486,8 @@
         3. If needed, assign {{VideoEncoder/[[codec implementation]]}} with an
             implementation supporting |config|.
         4. Configure {{VideoEncoder/[[codec implementation]]}} with |config|.
-        5. [=queue a task=] to run the following steps:
+        5. Assign |config| to {{VideoEncoder/[[active encoder config]]}}.
+        6. [=queue a task=] to run the following steps:
             1. Assign `false` to {{VideoEncoder/[[message queue blocked]]}}.
             2. [=Queue a task=] to [=Process the control message queue=].
     3. Return `"processed"`.