diff --git a/BOOK/general/prog/rust.xml b/BOOK/general/prog/rust.xml
index 081b56ae09..0a942bfd00 100644
--- a/BOOK/general/prog/rust.xml
+++ b/BOOK/general/prog/rust.xml
@@ -179,7 +179,10 @@ EOF</userinput></screen>
       compile for the thumbv6m-none-eabi target, but the BLFS build does not cater for
       that, and all 105 tests in debuginfo-gdb will fail if
       <application>gdb</application> has not been installed. Several other tests in
-      run-make can also fail.
+      run-make can also fail. With <application>glibc-2.27</application> the stack
+      guard page has been moved to just beyond the stack, instead of within it. That
+      causes three run-pass tests (out-of-stack.rs, stack-probes-lto.rs,
+      stack-probes.rs) to fail.
     </para>
 
     <para>