diff --git a/ChangeLog b/ChangeLog
index 08010d205..25c7c2c95 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2006-10-10  Richard Frith-Macdonald <rfm@gnu.org>
+
+	* Source/NSDecimalNumber.m: Implement coding/decoding
+
 2006-10-09  Nicola Pero <nicola.pero@meta-innovation.com>
 
 	* GNUmakefile: Do not include GNUmakefile.local.
diff --git a/Source/NSDecimalNumber.m b/Source/NSDecimalNumber.m
index db54b29df..f466dc16a 100644
--- a/Source/NSDecimalNumber.m
+++ b/Source/NSDecimalNumber.m
@@ -29,6 +29,8 @@
 #include "Foundation/NSException.h"
 #include "Foundation/NSDecimal.h"
 #include "Foundation/NSDecimalNumber.h"
+#include "Foundation/NSCoder.h"
+#include "Foundation/NSPortCoder.h"
 #include "GSPrivate.h"
 
 // shared default behavior for NSDecimalNumber class
@@ -663,6 +665,32 @@ static NSDecimalNumber *one;
   return [[isa defaultBehavior] scale];
 }
 
+- (Class) classForCoder
+{
+  return [NSDecimalNumber class];
+}
+
+- (id) replacementObjectForPortCoder: (NSPortCoder*)aCoder
+{
+  if ([aCoder isByref] == NO)
+    return self;
+  return [super replacementObjectForPortCoder: aCoder];
+}
+
+- (void) encodeWithCoder: (NSCoder*)coder
+{
+  NSString	*s = [self descriptionWithLocale: nil];
+
+  [coder encodeObject: s];
+}
+
+- (id) initWithCoder: (NSCoder*)coder
+{
+  NSString	*s = [coder decodeObject];
+
+  return [self initWithString: s locale: nil];
+}
+
 @end
 
 @implementation NSNumber (NSDecimalNumber)