diff --git a/ChangeLog b/ChangeLog
index 2b8abcb03..a8da82c73 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -11,6 +11,10 @@
 	* Source/NSArray.m: New MacOS-X methods ([-initWithArray:copyItems:])
 	([-exchangeObjectAtIndex:withObjectAtIndex:])
 	* Source/NSTimer.m: Update for compatibility with latest MacOS-X
+	* Source/NSObject.m: New ([+isSubclassOfClass:]) and perform
+	cancellation from MacOS-X
+	* Source/NSRunloop.m: New perform cancellation method from MacOS-X
+	proofreading help/fixes from David Ayers.
  
 2002-08-25  Richard Frith-Macdonald <rfm@gnu.org>
 
diff --git a/Source/GSArray.m b/Source/GSArray.m
index fc290f99e..700f94161 100644
--- a/Source/GSArray.m
+++ b/Source/GSArray.m
@@ -370,7 +370,7 @@ static SEL	eqSel;
     {
       [NSException raise: NSRangeException format:
 	@"in %@:, index %d is out of range",
-	NSStringFromSelector(_cmd), i1];
+	NSStringFromSelector(_cmd), i2];
     }
   if (i1 != i2)
     {
diff --git a/Source/NSCalendarDate.m b/Source/NSCalendarDate.m
index 586281291..9cf13db2e 100644
--- a/Source/NSCalendarDate.m
+++ b/Source/NSCalendarDate.m
@@ -1694,7 +1694,7 @@ static inline int getDigits(const char *from, char *to, int limit)
 		[date timeIntervalSinceReferenceDate]];
   else
     [NSException raise: NSInvalidArgumentException
-		format: @"%@ invalid date given", NSStringFromSelector(_cmd)];
+      format: @"%@ invalid date given - %@", NSStringFromSelector(_cmd), date];
 
   end = (NSCalendarDate*)[self laterDate: tmp];
   if (end == self)
diff --git a/Source/NSTimer.m b/Source/NSTimer.m
index 343e4de16..97c89f8f0 100644
--- a/Source/NSTimer.m
+++ b/Source/NSTimer.m
@@ -51,7 +51,7 @@ static Class	NSDate_class;
  * Initialise the receive, a newly allocated NSTimer object.<br />
  * The fd argument specifies an initial fire date ... if it is not
  * supplied (a nil object) then the ti argument is used to create
- * a astart date relative to the current time.<br />
+ * a start date relative to the current time.<br />
  * The ti argument specifies the time (in seconds) between the firing.
  * If it is less than or equal to 0.0 then a small interval is chosen
  * automatically.<br />
@@ -269,7 +269,7 @@ static Class	NSDate_class;
 /**
  * Change the fire date for the receiver.<br />
  * NB. You should <em>NOT</em> use this method for a timer which has
- * been added to a run loop.  The only time whan it is safe to modify
+ * been added to a run loop.  The only time when it is safe to modify
  * the fire date of a timer in a run loop is for a repeating timer
  * when the timer is actually in the process of firing.
  */