diff --git a/googletest/samples/sample1.cc b/googletest/samples/sample1.cc
index 13cec1d..1d42759 100644
--- a/googletest/samples/sample1.cc
+++ b/googletest/samples/sample1.cc
@@ -41,7 +41,7 @@
   return result;
 }
 
-// Returns true iff n is a prime number.
+// Returns true if and only if n is a prime number.
 bool IsPrime(int n) {
   // Trivial case 1: small numbers
   if (n <= 1) return false;