diff --git a/xml/System/Single.xml b/xml/System/Single.xml
index 2be311af216..f989efc0084 100644
--- a/xml/System/Single.xml
+++ b/xml/System/Single.xml
@@ -2958,7 +2958,7 @@ This method correctly handles floating-point values and so `2.0` and `3.0` will
       </Parameters>
       <Docs>
         <param name="f">A single-precision floating-point number.</param>
-        <summary>Determines whether the specified value is normal.</summary>
+        <summary>Determines whether the specified value is not NaN, not infinite, not subnormal, and not zero.</summary>
         <returns>
           <see langword="true" /> if <paramref name="f" /> is normal; <see langword="false" /> otherwise.</returns>
         <remarks>This effectively checks the value is not NaN, not infinite, not subnormal, and not zero.</remarks>