Update README.md
diff --git a/README b/README
deleted file mode 100644
index 80ee6e4..0000000
--- a/README
+++ /dev/null
@@ -1,17 +0,0 @@
-MochiWeb is an Erlang library for building lightweight HTTP servers.
-
-The latest version of MochiWeb is available at http://github.com/mochi/mochiweb
-
-The mailing list for MochiWeb is at http://groups.google.com/group/mochiweb/
-
-R12B compatibility:
-The master of MochiWeb is tested with R14A and later. A branch compatible
-with R12B is maintained separately at http://github.com/lemenkov/mochiweb
-The R12B branch of that repository is mirrored in the official repository
-occasionally for convenience.
-
-To create a new mochiweb using project:
-   make app PROJECT=project_name
-
-To create a new mochiweb using project in a specific directory:
-   make app PROJECT=project_name PREFIX=$HOME/projects/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..d39374a
--- /dev/null
+++ b/README.md
@@ -0,0 +1,20 @@
+MochiWeb is an Erlang library for building lightweight HTTP servers.
+
+The latest version of MochiWeb is available at http://github.com/mochi/mochiweb
+
+The mailing list for MochiWeb is at http://groups.google.com/group/mochiweb/
+
+To create a new mochiweb using project:
+   make app PROJECT=project_name
+
+To create a new mochiweb using project in a specific directory:
+   make app PROJECT=project_name PREFIX=$HOME/projects/
+
+MochiWeb is currently tested with Erlang/OTP R15B03 through 21.1.
+
+# OTP 21.2 warning
+
+OTP 21.2 (up to and including 21.2.2) introduced an SSL regression that
+makes these releases unsafe to use. See [ERL-830](https://bugs.erlang.org/browse/ERL-830).
+This issue has been fixed in the maintenance branch but a release is not
+yet available.