Index: src/OFIntrospection.h
==================================================================
--- src/OFIntrospection.h
+++ src/OFIntrospection.h
@@ -73,11 +73,11 @@
  */
 @interface OFProperty: OFObject
 {
 	OFString *_name;
 	unsigned int _attributes;
-	OFString *_Nullable _getter, *_Nullable _setter;
+	OFString *_Nullable _getter, *_Nullable _setter, *_Nullable iVar;
 }
 
 /*!
  * @brief The name of the property.
  */
@@ -110,10 +110,15 @@
 /*!
  * @brief The name of the setter.
  */
 @property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFString *setter;
 
+/*!
+ * @brief The name of the backing iVar.
+ */
+@property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFString *iVar;
+
 - (instancetype)init OF_UNAVAILABLE;
 @end
 
 /*!
  * @class OFInstanceVariable OFIntrospection.h ObjFW/OFIntrospection.h

Index: src/OFIntrospection.m
==================================================================
--- src/OFIntrospection.m
+++ src/OFIntrospection.m
@@ -134,11 +134,11 @@
 }
 @end
 
 @implementation OFProperty
 @synthesize name = _name, attributes = _attributes;
-@synthesize getter = _getter, setter = _setter;
+@synthesize getter = _getter, setter = _setter, iVar = _iVar;
 
 - (instancetype)init
 {
 	OF_INVALID_INIT_METHOD
 }
@@ -183,10 +183,15 @@
 
 		while (*attributes != '\0') {
 			const char *start;
 
 			switch (*attributes) {
+			case 'T':
+				while (*attributes != ',' &&
+				    *attributes != '\0')
+					attributes++;
+				break;
 			case 'R':
 				_attributes |= OF_PROPERTY_READONLY;
 				attributes++;
 				break;
 			case 'C':
@@ -242,15 +247,25 @@
 				attributes++;
 				break;
 			case 'P':
 				attributes++;
 				break;
-			case 'T':
-			case 't':
+			case 'V':
+				start = ++attributes;
+
+				if (_iVar != nil)
+					@throw [OFInitializationFailedException
+					    exceptionWithClass: [self class]];
+
 				while (*attributes != ',' &&
 				    *attributes != '\0')
 					attributes++;
+
+				_iVar = [[OFString alloc]
+				    initWithUTF8String: start
+						length: attributes - start];
+
 				break;
 			default:
 				@throw [OFInitializationFailedException
 				    exceptionWithClass: [self class]];
 			}
@@ -315,13 +330,14 @@
 	return [OFString
 	    stringWithFormat: @"<%@: %@\n"
 			      @"\tAttributes = 0x%03X\n"
 			      @"\tGetter = %@\n"
 			      @"\tSetter = %@\n"
+			      @"\tiVar = %@\n"
 			      @">",
 			      [self class], _name, _attributes,
-			      _getter, _setter];
+			      _getter, _setter, _iVar];
 }
 
 - (bool)isEqual: (id)object
 {
 	OFProperty *otherProperty;