diff --git a/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs b/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs
index c0b85e2778a51..c7b0a4aa12fd0 100644
--- a/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs
+++ b/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs
@@ -6624,14 +6624,24 @@ private bool HasTopLevelNullabilityConversion(TypeWithAnnotations source, TypeWi
         }
 
         /// <summary>
-        /// Apply the conversion to the type of the operand and return the resulting type. (If the
-        /// operand does not have an explicit type, the operand expression is used for the type.)
-        /// If `checkConversion` is set, the incoming conversion is assumed to be from binding and will be
-        /// re-calculated, this time considering nullability. (Note that the conversion calculation considers
-        /// nested nullability only. The caller is responsible for checking the top-level nullability of
-        /// the type returned by this method.) `trackMembers` should be set if the nullability of any
-        /// members of the operand should be copied to the converted result when possible.
+        /// Apply the conversion to the type of the operand and return the resulting type.
+        /// If the operand does not have an explicit type, the operand expression is used.
         /// </summary>
+        /// <param name="checkConversion">
+        /// If <see langword="true"/>, the incoming conversion is assumed to be from binding
+        /// and will be re-calculated, this time considering nullability.
+        /// Note that the conversion calculation considers nested nullability only.
+        /// The caller is responsible for checking the top-level nullability of
+        /// the type returned by this method.
+        /// </param>
+        /// <param name="trackMembers">
+        /// If <see langword="true"/>, the nullability of any members of the operand
+        /// will be copied to the converted result when possible.
+        /// </param>
+        /// <param name="useLegacyWarnings">
+        /// If <see langword="true"/>, indicates that the "non-safety" diagnostic <see cref="ErrorCode.WRN_ConvertingNullableToNonNullable"/>
+        /// should be given for an invalid conversion.
+        /// </param>
         private TypeWithState VisitConversion(
             BoundConversion? conversionOpt,
             BoundExpression conversionOperand,