diff --git a/ChangeLog b/ChangeLog
index 01d2dbf7c..b8e66c7a2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2010-05-25  BVK Chaitanya  <bvk.groups@gmail.com>
+
+	* INSTALL: Added flex >= 2.5.35 requirement.
+
 2010-05-23  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* commands/usbtest.c (grub_usb_get_string): Properly support UTF-16.
diff --git a/INSTALL b/INSTALL
index 0dd408bcc..7186d20db 100644
--- a/INSTALL
+++ b/INSTALL
@@ -16,6 +16,7 @@ configuring the GRUB.
 * GNU Bison 2.3 or later
 * GNU gettext 0.17 or later
 * GNU binutils 2.9.1.0.23 or later
+* Flex 2.5.35 or later
 * Other standard GNU/Unix tools
 
 If you use a development snapshot or want to hack on GRUB you may