diff --git a/dix/resource.c b/dix/resource.c
index 4468f4575..584ac94fb 100644
--- a/dix/resource.c
+++ b/dix/resource.c
@@ -169,12 +169,6 @@ static void RebuildTable(
 #define INITHASHSIZE 6
 #define MAXHASHSIZE 11
 
-typedef struct _Resource {
-    struct _Resource	*next;
-    XID			id;
-    RESTYPE		type;
-    pointer		value;
-} ResourceRec, *ResourcePtr;
 #define NullResource ((ResourcePtr)NULL)
 
 typedef struct _ClientResource {
diff --git a/include/resource.h b/include/resource.h
index 3231e8cd9..902305805 100644
--- a/include/resource.h
+++ b/include/resource.h
@@ -53,10 +53,27 @@ SOFTWARE.
  * STUFF FOR RESOURCES 
  *****************************************************************/
 
-/* classes for Resource routines */
+/* Resource structures */
 
 typedef unsigned long RESTYPE;
 
+typedef struct _Private {
+    int			index;
+    pointer		value;
+    struct _Private	*next;
+} PrivateRec, *PrivatePtr;
+
+typedef struct _Resource {
+    struct _Resource	*next;
+    struct _Resource	*nexttype;
+    XID			id;
+    RESTYPE		type;
+    pointer		value;
+    PrivatePtr		privates;
+} ResourceRec, *ResourcePtr;
+
+/* classes for Resource routines */
+
 #define RC_VANILLA	((RESTYPE)0)
 #define RC_CACHED	((RESTYPE)1<<31)
 #define RC_DRAWABLE	((RESTYPE)1<<30)
@@ -66,7 +83,12 @@ typedef unsigned long RESTYPE;
  *  Extensions can use this too!
  */
 #define RC_NEVERRETAIN	((RESTYPE)1<<29)
-#define RC_LASTPREDEF	RC_NEVERRETAIN
+/*  Use class RC_PRIVATES for resources that support extra private data.
+ *  Resources having this class must provide a field of type ResourcePtr
+ *  at the top of the resource structure, which must be initalized to NULL.
+ */
+#define RC_PRIVATES	((RESTYPE)1<<28)
+#define RC_LASTPREDEF	RC_PRIVATES
 #define RC_ANY		(~(RESTYPE)0)
 
 /* types for Resource routines */