Add information about required local cahe

README

@@ -1,13 +1,13 @@
-2010-04-30
+2016-04-15
 ----------
 
-# Copyright (C) 2006, 2007, 2008, 2009, 2010, 2014 Werner Baumann
+# Copyright (C) 2006, 2007, 2008, 2009, 2010, 2014, 2016 Werner Baumann
 
 # Copying and distribution of this file, with or without modification, are
 # permitted in any medium without royalty.
 
 
-DAVFS2 1.4.6 README
+DAVFS2 X.X.X README
 ===================
 
     1 INTRODUCTION
@@ -69,6 +69,11 @@ make better use of the WebDAV protocol. Whether it really does, depends on the
 implementation. But if a free WebDAV enabled application is available, you
 might try it first.
 
+davfs2 can't (always) replace lodal disk space. Due to the nature of WebDAV
+davfs2 can't directly redirect reading and writing to the WebDAV server. davfs2
+always needs local copies of all open files. So if you have not enough sidk
+space to hold these local copies, davfs2 will not help.
+
 
 2 SECURITY CONSIDERATIONS
 =========================
@@ -161,6 +166,9 @@ changes into daemon mode.
 5 CACHE
 =======
 
+davfs2 will store a local copy of all open files in its cache. So make sure
+there is enough local disk space available in the cache directory.
+
 There are two reasons for caching:
 
 - The coda kernel file system expects a local copy of the file to act on.