diff --git a/googlemock/include/gmock/gmock-matchers.h b/googlemock/include/gmock/gmock-matchers.h
index 7db65a48..d12d7bf7 100644
--- a/googlemock/include/gmock/gmock-matchers.h
+++ b/googlemock/include/gmock/gmock-matchers.h
@@ -1453,7 +1453,7 @@ class TrulyMatcher {
   // interested in the address of the argument.
   template <typename T>
   bool MatchAndExplain(T& x,  // NOLINT
-                       MatchResultListener* /* listener */) const {
+                       MatchResultListener* listener) const {
     // Without the if-statement, MSVC sometimes warns about converting
     // a value to bool (warning 4800).
     //
@@ -1462,6 +1462,7 @@ class TrulyMatcher {
     // having no operator!().
     if (predicate_(x))
       return true;
+    *listener << "didn't satisfy the given predicate";
     return false;
   }
 
diff --git a/googlemock/test/gmock-matchers_test.cc b/googlemock/test/gmock-matchers_test.cc
index 0ce5b588..b7e253d7 100644
--- a/googlemock/test/gmock-matchers_test.cc
+++ b/googlemock/test/gmock-matchers_test.cc
@@ -2984,6 +2984,13 @@ TEST(TrulyTest, WorksForByRefArguments) {
   EXPECT_FALSE(m.Matches(n));
 }
 
+// Tests that Truly(predicate) provides a helpful reason when it fails.
+TEST(TrulyTest, ExplainsFailures) {
+  StringMatchResultListener listener;
+  EXPECT_FALSE(ExplainMatchResult(Truly(IsPositive), -1, &listener));
+  EXPECT_EQ(listener.str(), "didn't satisfy the given predicate");
+}
+
 // Tests that Matches(m) is a predicate satisfied by whatever that
 // matches matcher m.
 TEST(MatchesTest, IsSatisfiedByWhatMatchesTheMatcher) {