Index: INSTALL.txt
===================================================================
--- INSTALL.txt	(revision 8127)
+++ INSTALL.txt	(working copy)
@@ -32,6 +32,7 @@
 	- SPL
 	- standard
 	- xml
+	- zlib
 	Some extensions can be optionally compiled into PHP. A list of loaded
 	extensions can be checked using the phpinfo() function.
 - memory_limit set to at least to 64M in php.ini
@@ -56,6 +57,7 @@
 	- SPL
 	- standard
 	- xml
+	- zlib
 	Some extensions can be optionally compiled into PHP. A list of loaded
 	extensions can be checked using the phpinfo() function.
 - memory_limit set to 128M or more in php.ini