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-rw-r--r--compiler/rustc_target/src/spec/mod.rs5
1 files changed, 5 insertions, 0 deletions
diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index a3f36e51f32..303be54a6d7 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -3568,6 +3568,11 @@ impl Target {
             "s390x" => (Architecture::S390x, None),
             "mips" | "mips32r6" => (Architecture::Mips, None),
             "mips64" | "mips64r6" => (
+                // While there are currently no builtin targets
+                // using the N32 ABI, it is possible to specify
+                // it using a custom target specification. N32
+                // is an ILP32 ABI like the Aarch64_Ilp32
+                // and X86_64_X32 cases above and below this one.
                 if self.options.llvm_abiname.as_ref() == "n32" {
                     Architecture::Mips64_N32
                 } else {