diff --git a/X10D.Tests/src/Linq/ByteTests.cs b/X10D.Tests/src/Linq/ByteTests.cs
index 57e3142..50d2006 100644
--- a/X10D.Tests/src/Linq/ByteTests.cs
+++ b/X10D.Tests/src/Linq/ByteTests.cs
@@ -31,6 +31,6 @@ public class ByteTests
         Assert.AreEqual(8, Enumerable.Range(1, 2).Product(Double));
         Assert.AreEqual(48, Enumerable.Range(1, 3).Product(Double));
 
-        // Π_(i=1)^(n(i*2)) will overflow at i=4 for byte
+        // Π_(i=1)^n (2i) will overflow at i=4 for byte
     }
 }
diff --git a/X10D.Tests/src/Linq/Int16Tests.cs b/X10D.Tests/src/Linq/Int16Tests.cs
index 75f658c..67e502e 100644
--- a/X10D.Tests/src/Linq/Int16Tests.cs
+++ b/X10D.Tests/src/Linq/Int16Tests.cs
@@ -35,6 +35,6 @@ public class Int16Tests
         Assert.AreEqual(384, Enumerable.Range(1, 4).Product(Double));
         Assert.AreEqual(3840, Enumerable.Range(1, 5).Product(Double));
 
-        // Π_(i=1)^(n(i*2)) will overflow at i=6 for short
+        // Π_(i=1)^n (2i) will overflow at i=6 for short
     }
 }
diff --git a/X10D.Tests/src/Linq/Int32Tests.cs b/X10D.Tests/src/Linq/Int32Tests.cs
index 5b0db1f..33cc4ce 100644
--- a/X10D.Tests/src/Linq/Int32Tests.cs
+++ b/X10D.Tests/src/Linq/Int32Tests.cs
@@ -38,6 +38,6 @@ public class Int32Tests
         Assert.AreEqual(10321920, Enumerable.Range(1, 8).Product(Double));
         Assert.AreEqual(185794560, Enumerable.Range(1, 9).Product(Double));
 
-        // Π_(i=1)^(n(i*2)) will overflow at i=10 for int
+        // Π_(i=1)^n (2i) will overflow at i=10 for int
     }
 }
diff --git a/X10D.Tests/src/Linq/UInt16Tests.cs b/X10D.Tests/src/Linq/UInt16Tests.cs
index b5a87c3..bf496e8 100644
--- a/X10D.Tests/src/Linq/UInt16Tests.cs
+++ b/X10D.Tests/src/Linq/UInt16Tests.cs
@@ -38,6 +38,6 @@ public class UInt16Tests
         Assert.AreEqual(3840U, Enumerable.Range(1, 5).Product(Double));
         Assert.AreEqual(46080U, Enumerable.Range(1, 6).Product(Double));
 
-        // Π_(i=1)^(n(i*2)) will overflow at i=7 for ushort
+        // Π_(i=1)^n (2i) will overflow at i=7 for ushort
     }
 }