diff --git a/llvm/include/llvm/Support/MathExtras.h b/llvm/include/llvm/Support/MathExtras.h
index ec9b5008792e17..640b3a11ce6c24 100644
--- a/llvm/include/llvm/Support/MathExtras.h
+++ b/llvm/include/llvm/Support/MathExtras.h
@@ -766,7 +766,7 @@ template <unsigned B> constexpr inline int32_t SignExtend32(uint32_t X) {
 }
 
 /// Sign-extend the number in the bottom B bits of X to a 32-bit integer.
-/// Requires 0 < B < 32.
+/// Requires 0 < B <= 32.
 inline int32_t SignExtend32(uint32_t X, unsigned B) {
   assert(B > 0 && "Bit width can't be 0.");
   assert(B <= 32 && "Bit width out of range.");
@@ -774,7 +774,7 @@ inline int32_t SignExtend32(uint32_t X, unsigned B) {
 }
 
 /// Sign-extend the number in the bottom B bits of X to a 64-bit integer.
-/// Requires 0 < B < 64.
+/// Requires 0 < B <= 64.
 template <unsigned B> constexpr inline int64_t SignExtend64(uint64_t x) {
   static_assert(B > 0, "Bit width can't be 0.");
   static_assert(B <= 64, "Bit width out of range.");
@@ -782,7 +782,7 @@ template <unsigned B> constexpr inline int64_t SignExtend64(uint64_t x) {
 }
 
 /// Sign-extend the number in the bottom B bits of X to a 64-bit integer.
-/// Requires 0 < B < 64.
+/// Requires 0 < B <= 64.
 inline int64_t SignExtend64(uint64_t X, unsigned B) {
   assert(B > 0 && "Bit width can't be 0.");
   assert(B <= 64 && "Bit width out of range.");