diff -r 740eaf575523 -r f7f01af63a02 docs/overview.txt
--- a/docs/overview.txt	Fri Apr 17 20:45:47 2009 +0000
+++ b/docs/overview.txt	Sun May 24 21:44:21 2009 +0000
@@ -277,13 +277,17 @@
   Show obsolete versions or tools. Most of the time, you don't want to base
   your toolchain on too old a version (of gcc, for example). But at times, it
   can come handy to use such an old version for regression tests. Those old
-  versions are hidden behind CT_OBSOLETE.
+  versions are hidden behind CT_OBSOLETE. Those versions (or features) are so
+  marked because maintaining support for those in crosstool-NG would be too
+  costly, time-wise, and time is dear.
 
 CT_EXPERIMENTAL:
   Show experimental versions or tools. Again, you might not want to base your
   toolchain on too recent tools (eg. gcc) for production. But if you need a
   feature present only in a recent version, or a new tool, you can find them
-  hidden behind CT_EXPERIMENTAL.
+  hidden behind CT_EXPERIMENTAL. Those versions (or features) did not (yet)
+  receive thorough testing in crosstool-NG, and/or are not mature enough to
+  be blindly trusted.
 
 Re-building an existing toolchain |
 ----------------------------------+