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-rw-r--r--doc/src/guide/book.asciidoc2
-rw-r--r--doc/src/guide/migrating_from_2.11.asciidoc15
2 files changed, 17 insertions, 0 deletions
diff --git a/doc/src/guide/book.asciidoc b/doc/src/guide/book.asciidoc
index 4448202..cf8c943 100644
--- a/doc/src/guide/book.asciidoc
+++ b/doc/src/guide/book.asciidoc
@@ -75,6 +75,8 @@ include::performance.asciidoc[Performance]
= Additional information
+include::migrating_from_2.11.asciidoc[Migrating from Cowboy 2.11 to 2.12]
+
include::migrating_from_2.10.asciidoc[Migrating from Cowboy 2.10 to 2.11]
include::migrating_from_2.9.asciidoc[Migrating from Cowboy 2.9 to 2.10]
diff --git a/doc/src/guide/migrating_from_2.11.asciidoc b/doc/src/guide/migrating_from_2.11.asciidoc
new file mode 100644
index 0000000..ab74642
--- /dev/null
+++ b/doc/src/guide/migrating_from_2.11.asciidoc
@@ -0,0 +1,15 @@
+[appendix]
+== Migrating from Cowboy 2.11 to 2.12
+
+Cowboy 2.12 contains a small security improvement for
+the HTTP/2 protocol.
+
+Cowboy 2.12 requires Erlang/OTP 24.0 or greater.
+
+=== Features added
+
+* A new HTTP/2 option `max_fragmented_header_block_size` has
+ been added to limit the size of header blocks that are
+ sent over multiple HEADERS and CONTINUATION frames.
+
+* Update Cowlib to 2.13.0.