diff --git a/compiler/rustc_target/src/spec/targets/aarch64_unknown_none.rs b/compiler/rustc_target/src/spec/targets/aarch64_unknown_none.rs
index 13d3b77588a0e..297bd0abc864e 100644
--- a/compiler/rustc_target/src/spec/targets/aarch64_unknown_none.rs
+++ b/compiler/rustc_target/src/spec/targets/aarch64_unknown_none.rs
@@ -30,6 +30,7 @@ pub(crate) fn target() -> Target {
         stack_probes: StackProbeType::Inline,
         panic_strategy: PanicStrategy::Abort,
         default_uwtable: true,
+        supports_xray: true,
         ..Default::default()
     };
     Target {
diff --git a/compiler/rustc_target/src/spec/targets/aarch64_unknown_none_softfloat.rs b/compiler/rustc_target/src/spec/targets/aarch64_unknown_none_softfloat.rs
index 05876891ebd7d..f6527d236d10c 100644
--- a/compiler/rustc_target/src/spec/targets/aarch64_unknown_none_softfloat.rs
+++ b/compiler/rustc_target/src/spec/targets/aarch64_unknown_none_softfloat.rs
@@ -27,6 +27,7 @@ pub(crate) fn target() -> Target {
         stack_probes: StackProbeType::Inline,
         panic_strategy: PanicStrategy::Abort,
         default_uwtable: true,
+        supports_xray: true,
         ..Default::default()
     };
     Target {
diff --git a/src/doc/unstable-book/src/compiler-flags/instrument-xray.md b/src/doc/unstable-book/src/compiler-flags/instrument-xray.md
index 7fb33cd68b4a3..68b881df47385 100644
--- a/src/doc/unstable-book/src/compiler-flags/instrument-xray.md
+++ b/src/doc/unstable-book/src/compiler-flags/instrument-xray.md
@@ -37,3 +37,4 @@ which on their own don't do anything useful.
 In order to actually trace the functions,
 you will need to link a separate runtime library of your choice,
 such as Clang's [XRay Runtime Library](https://www.llvm.org/docs/XRay.html#xray-runtime-library).
+On targets where such a runtime is not available but instrumentation is supported, you must supply and link your own runtime library.