diff -r ef0373b55136 -r 758a864f9613 src/script/api/qscriptcontext.cpp
--- a/src/script/api/qscriptcontext.cpp	Fri Sep 17 08:34:18 2010 +0300
+++ b/src/script/api/qscriptcontext.cpp	Mon Oct 04 01:19:32 2010 +0300
@@ -323,6 +323,9 @@
 
   When a function is called as constructor, the thisObject()
   contains the newly constructed object to be initialized.
+
+  \note This function is only guaranteed to work for a context
+  corresponding to native functions.
 */
 bool QScriptContext::isCalledAsConstructor() const
 {
@@ -413,6 +416,9 @@
   object provides access to the local variables associated with this
   context.
 
+  \note The activation object might not be available if there is no
+  active QScriptEngineAgent, as it might be optimized.
+
   \sa argument(), argumentsObject()
 */
 
@@ -472,6 +478,10 @@
   activation.
 
   If \a activation is not an object, this function does nothing.
+
+  \note For a context corresponding to a JavaScript function, this is only
+  guarenteed to work if there was an QScriptEngineAgent active on the
+  engine while the function was evaluated.
 */
 void QScriptContext::setActivationObject(const QScriptValue &activation)
 {