diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c4a4598..a663bc72 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@
 * The clang-format script is now no longer "hidden" [#48](https://github.com/CLIUtils/CLI11/pull/48)
 * The order is now preserved for subcommands (list and callbacks) [#49](https://github.com/CLIUtils/CLI11/pull/49)
 * Tests now run individually, utilizing CMake 3.10 additions if possible [#50](https://github.com/CLIUtils/CLI11/pull/50)
+* Failure messages are now customizable, with a shorter default [#52](https://github.com/CLIUtils/CLI11/pull/52)
 
 
 ## Version 1.2
diff --git a/README.md b/README.md
index f3d49bd8..d6e93d8c 100644
--- a/README.md
+++ b/README.md
@@ -214,6 +214,7 @@ There are several options that are supported on the main app and subcommands. Th
 * `.allow_extras()`: Do not throw an error if extra arguments are left over
 * `.prefix_command()`: Like `allow_extras`, but stop immediately on the first unrecognised item. It is ideal for allowing your app or subcommand to be a "prefix" to calling another app.
 * `.set_footer(message)`: Set text to appear at the bottom of the help string.
+* `.set_failure_message(func)`: Set the failure message function. Two provided: `CLI::FailureMessage::help` and CLI::FailureMessage::simple` (the default).
 * `.group(name)`: Set a group name, defaults to `"Subcommands"`. Setting `""` will be hide the subcommand.
 
 > Note: if you have a fixed number of required positional options, that will match before subcommand names.