v4.19.13 snapshot.
diff --git a/Documentation/isdn/00-INDEX b/Documentation/isdn/00-INDEX
new file mode 100644
index 0000000..2d1889b
--- /dev/null
+++ b/Documentation/isdn/00-INDEX
@@ -0,0 +1,42 @@
+00-INDEX
+ - this file (info on ISDN implementation for Linux)
+CREDITS
+ - list of the kind folks that brought you this stuff.
+HiSax.cert
+ - information about the ITU approval certification of the HiSax driver.
+INTERFACE
+ - description of isdn4linux Link Level and Hardware Level interfaces.
+INTERFACE.fax
+ - description of the fax subinterface of isdn4linux.
+INTERFACE.CAPI
+ - description of kernel CAPI Link Level to Hardware Level interface.
+README
+ - general info on what you need and what to do for Linux ISDN.
+README.FAQ
+ - general info for FAQ.
+README.HiSax
+ - info on the HiSax driver which replaces the old teles.
+README.audio
+ - info for running audio over ISDN.
+README.avmb1
+ - info on driver for AVM-B1 ISDN card.
+README.concap
+ - info on "CONCAP" encapsulation protocol interface used for X.25.
+README.diversion
+ - info on module for isdn diversion services.
+README.fax
+ - info for using Fax over ISDN.
+README.gigaset
+ - info on the drivers for Siemens Gigaset ISDN adapters
+README.hfc-pci
+ - info on hfc-pci based cards.
+README.hysdn
+ - info on driver for Hypercope active HYSDN cards
+README.mISDN
+ - info on the Modular ISDN subsystem (mISDN)
+README.syncppp
+ - info on running Sync PPP over ISDN.
+README.x25
+ - info for running X.25 over ISDN.
+syncPPP.FAQ
+ - frequently asked questions about running PPP over ISDN.