diff --git a/libisoburn/libisoburn.h b/libisoburn/libisoburn.h
index c645bcbf..726890bb 100644
--- a/libisoburn/libisoburn.h
+++ b/libisoburn/libisoburn.h
@@ -124,6 +124,22 @@ One should inquire isoburn_drive_wrote_well() to learn about overall success.
 Finally one must call isoburn_activate_session() which will complete any
 eventual multi-session emulation.
 
+
+                         Application Constraints
+
+Applications shall include libisofs/libisofs.h , libburn/libburn.h and this
+file itself: libisoburn/libisoburn.h .
+They shall link with -lisofs -lburn -lisoburn or with the .o files emerging
+from building those libraries from their sources.
+
+Applications must use 64 bit off_t, e.g. on 32-bit Linux by defining
+  #define _LARGEFILE_SOURCE
+  #define _FILE_OFFSET_BITS 64
+or take special precautions to interface with the library by 64 bit integers
+where above .h files prescribe off_t. Not to use 64 bit file i/o will keep 
+the application from producing and processing ISO images of more than 2 GB 
+size.
+
 */
 
 
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index b221bc3e..79164a77 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2009.01.26.173606"
+#define Xorriso_timestamP "2009.01.27.121417"