diff --git a/Network.ObjectID.md b/Network.ObjectID.md
index 6872d36..182973c 100644
--- a/Network.ObjectID.md
+++ b/Network.ObjectID.md
@@ -2,4 +2,13 @@ ObjectIDs are identifiers for dynamic objects. Dynamic objects usually consist o
 | Name | Type | Required | Description |
 | ---- | ---- | :------: | :---------- |
 | Short | Byte | ✗ | Refers to an ID previously assigned in the connection. |
-| Long | String | `Short == 0` | If **Short** is 0, the long form is used. |
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+| Long | String | `Short == 0` | If **Short** is 0, the long form is used. |
+
+## Constant Short IDs
+Some Short IDs are constant and refer to specific 
+|  ID | Description |
+| --: | :---------- |
+|   1 | Always refers to the current client. |
+| 253 | Refers to the current room. |
+| 254 | Client-side only. |
+| 255 | Properties only. |
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