diff --git a/llvm/lib/Support/RISCVISAInfo.cpp b/llvm/lib/Support/RISCVISAInfo.cpp
index 85386dfa9bba..7cfadec082fd 100644
--- a/llvm/lib/Support/RISCVISAInfo.cpp
+++ b/llvm/lib/Support/RISCVISAInfo.cpp
@@ -758,7 +758,7 @@ RISCVISAInfo::parseArchString(StringRef Arch, bool EnableExperimentalExtension,
   // Parse the ISA string containing non-standard user-level
   // extensions, standard supervisor-level extensions and
   // non-standard supervisor-level extensions.
-  // These extensions start with 'z', 's', 's', 'sx' prefixes, follow a
+  // These extensions start with 'z', 's', 'x', 'sx' prefixes, follow a
   // canonical order, might have a version number (major, minor)
   // and are separated by a single underscore '_'.
   // Set the hardware features for the extensions that are supported.