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-rw-r--r--winsup/doc/cygwinenv.sgml5
1 files changed, 4 insertions, 1 deletions
diff --git a/winsup/doc/cygwinenv.sgml b/winsup/doc/cygwinenv.sgml
index 782c28959..744927554 100644
--- a/winsup/doc/cygwinenv.sgml
+++ b/winsup/doc/cygwinenv.sgml
@@ -22,7 +22,10 @@ pipe to binary by default.
</para>
</listitem>
<listitem>
-<para><envar>check_case:level</envar> - Controls the behavior of
+<para><envar>check_case:level</envar> - THIS OPTION IS DEPRECATED.
+Don't use it unless you know what you're doing and don't see any way
+around it. And even then, this option is error prone, slows down Cygwin
+and not well maintained. This option controls the behavior of
Cygwin when a user tries to open or create a file using a case different from
the case of the path as saved on the disk.
<literal>level</literal> is one of <literal>relaxed</literal>,