Documentation/releases: Add ASan to 4.13 relnotes

Change-Id: I2953729c69dfcfa8b34192b3e1623fdfad87ca3a
Signed-off-by: Harshit Sharma <harshitsharmajs@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45118
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/Documentation/releases/coreboot-4.13-relnotes.md b/Documentation/releases/coreboot-4.13-relnotes.md
index 8d19067..ddbea81 100644
--- a/Documentation/releases/coreboot-4.13-relnotes.md
+++ b/Documentation/releases/coreboot-4.13-relnotes.md
@@ -49,6 +49,15 @@
 CPU threads as possible limited only by SMRAM space and not by 64K. By default
 this loader version is disabled. Please see cpu/x86/Kconfig for more info.
 
+### Address Sanitizer
+
+coreboot now has an in-built Address Sanitizer, a runtime memory debugger
+designed to find out-of-bounds access and use-after-scope bugs. It is made
+available on all x86 platforms in ramstage and on QEMU i440fx, Intel Apollo
+Lake, and Haswell in romstage. Further, it can be enabled in romstage on other
+x86 platforms as well. Refer [ASan documentation](../technotes/asan.md) for
+more info.
+
 ### Initial support for x86_64
 
 The x86_64 code support has been revived and enabled for qemu. While it started