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diff --git a/gdb/README b/gdb/README
index 5881be23af..8a91aab2a4 100644
--- a/gdb/README
+++ b/gdb/README
@@ -538,6 +538,19 @@ more obscure GDB `configure' options are not listed here.
      the compiler, which will fail the compilation if the compiler
      outputs any warning messages.
 
+`--enable-ubsan'
+     Enable the GCC undefined behavior sanitizer.  By default this is
+     disabled in GDB releases, but enabled when building from git.
+     The undefined behavior sanitizer checks for C++ undefined
+     behavior.  It has a performance cost, so if you are looking at
+     GDB's performance, you should disable it.
+
+`--enable-unit-tests[=yes|no]'
+     Enable (i.e., include) support for unit tests when compiling GDB
+     and GDBServer.  Note that if this option is not passed, GDB will
+     have selftests if it is a development build, and will *not* have
+     selftests if it is a non-development build.
+
 `configure' accepts other options, for compatibility with configuring
 other GNU tools recursively.