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diff --git a/informqr/informqr.md b/informqr/informqr.md
index 4001497..8295e07 100644
--- a/informqr/informqr.md
+++ b/informqr/informqr.md
@@ -1,4 +1,4 @@
-% Inform in four minutes
+o% Inform in four minutes
 % Roger Firth <roger@firthworks.com>
 
 A quick reference to the Inform programming language.
@@ -236,3 +236,27 @@ array, the entries can be accessed using
 A property variable inherited from an object's class is
 addressed by *object.class::property*; this gives the
 original value prior to any changes within the object.
+
+Manipulating the object tree
+----------------------------
+
+To change object relationships at run-time:
+
+    move object to parent_object ;
+    remove object ;
+
+To return the parent of an object (or nothing):
+
+    parent(object)
+
+To return the first child of an object (or nothing):
+
+    child(object)
+
+To return the adjacent child of an object's parent (or nothing):
+
+    sibling(object)
+
+To return the number of child objects directly below an object:
+
+    children(object)
\ No newline at end of file