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diff --git a/CHANGELOG b/CHANGELOG
index e6e6f79..0d0669a 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,8 +1,51 @@
 Possible compatibility problems with earlier versions marked with '*'.
 
-Added bend_start/bend_stop handlers for server. These handler
-are called on start/stop of server. For windows they are called
-whenever service is started/stopped.
+Implemented ISO ILL protocol. Refer to stuff in sub directory ill.
+
+--- 1.5 1999/12/10
+
+On UNIX, the generated makefile now supports a proper 'make install'.
+The prefix can be set via GNU configure to set the install location
+(default is /usr/local).
+
+* YAZ programs client and ztest were renamed to yaz-client and
+yaz-ztest to avoid conflicts when users install YAZ in "standard"
+locations, such as /usr/bin,/usr/local/bin,etc.
+
+* YAZ Header files were moved from include to include/yaz. YAZ Header
+files are referred to as include <yaz/log.h> rather than <log.h>.
+The YAZ include path (-I ..) is therefore the same as before. Programmers
+should update their #include statements or use -Ipath/include/yaz
+instead. The main motivation for doing this change is that YAZ header files
+can be installed in "standard" locations /usr/include,/usr/local/include 
+without introducing conflicts, since ALL YAZ header files are stored
+in subdirectory yaz (under /usr/include for example).
+
+Compilation of YAZ for WIN32 is now handled by an nmake-style makefile 
+rather than project/workspace files. We switched because project files
+are incompatible between Visual C++ 5 and 6. Refer to windows.txt for
+details.
+
+Changed name of logging function, logf, to yaz_log, to prevent name
+clash with some math-log functions. The YAZ header log.h defines logf
+to yaz_log (#define) so there should be no incompatibilities by this
+modification.
+
+Added bend_start/bend_stop handlers for server. These handler are
+called on start/stop of server. For windows they are called whenever
+a service is started/stopped.
+
+* YAZ now auto-generates decoders/encoders for the Z39.50 protocol using
+a fairly small ASN.1 compiler written in Tcl. The compiler is located
+in util/yc.tcl. The auto-generated C code structures are, in a few
+cases, incompatible with the old decoders. There are differences in the
+following C structures Z_DiagRec, Z_External, Z_SortRequest, Z_SortResponse,
+Z_AttributesPlusTerm, Z_ProximityOperator, Z_DefaultDiagFormat.
+The preprocessor variable ASN_COMPILED is defined when the compiled
+ASN.1 is being used. Encoder/decoder routines as well as the Z39.50
+protocol ASN.1 is located sub directory <tt>z39.50</tt>. If you
+wish to use the old encoders/decoders you can specify --disable-yc
+for configure.
 
 Assigned OID for old DB Update (VAL_DBUPDATE0). Updated YAZ compiled
 version so that it supports both new - and old version of DB Update