diff --git a/src/librustdoc/clean/cfg.rs b/src/librustdoc/clean/cfg.rs
index 0d213a5a2de..9e9c4dfb506 100644
--- a/src/librustdoc/clean/cfg.rs
+++ b/src/librustdoc/clean/cfg.rs
@@ -517,6 +517,8 @@ fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
                         "msp430" => "MSP430",
                         "powerpc" => "PowerPC",
                         "powerpc64" => "PowerPC-64",
+                        "riscv32" => "RISC-V RV32",
+                        "riscv64" => "RISC-V RV64",
                         "s390x" => "s390x",
                         "sparc64" => "SPARC64",
                         "wasm32" | "wasm64" => "WebAssembly",