Adds Fuchsia disclaimer.

Change-Id: I84af407cd855009980b850a90933b837e1b5b808
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a7bd63f..5d72460 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,3 +1,16 @@
+#############################################################
+#                NOTE TO FUCHSIA DEVELOPERS
+#
+# Do not use CMake within the Fuchsia project. This CMake file is
+# used only for the Cobalt stand-alone build, not for building
+# Cobalt's Fuchsia client, nor any other component of Fuchsia.
+#
+# See:
+# https://fuchsia.atlassian.net/projects/CB/issues/CB-61
+#############################################################
+
+# note(rudominer) This file was hand-edited to work with the Cobalt build.
+
 cmake_minimum_required(VERSION 2.4.4)
 set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS ON)