diff --git a/circuitbreaker/util_test.go b/circuitbreaker/util_test.go
index 0039b6d..b5c0391 100644
--- a/circuitbreaker/util_test.go
+++ b/circuitbreaker/util_test.go
@@ -40,7 +40,7 @@
 
 	// Switch the endpoint to start throwing errors.
 	m.err = errors.New("tragedy+disaster")
-	m.thru = 0
+	m.through = 0
 
 	// The first several should be allowed through and yield our error.
 	for i := 0; shouldPass(i); i++ {
@@ -49,7 +49,7 @@
 		}
 		time.Sleep(requestDelay)
 	}
-	thru := m.thru
+	through := m.through
 
 	// But the rest should be blocked by an open circuit.
 	for i := 0; i < 10; i++ {
@@ -60,17 +60,17 @@
 	}
 
 	// Make sure none of those got through.
-	if want, have := thru, m.thru; want != have {
+	if want, have := through, m.through; want != have {
 		t.Errorf("%s: want %d, have %d", caller, want, have)
 	}
 }
 
 type mock struct {
-	thru int
+	through int
 	err  error
 }
 
 func (m *mock) endpoint(context.Context, interface{}) (interface{}, error) {
-	m.thru++
+	m.through++
 	return struct{}{}, m.err
 }
diff --git a/metrics/expvar/expvar.go b/metrics/expvar/expvar.go
index a76c9f0..dcb5d62 100644
--- a/metrics/expvar/expvar.go
+++ b/metrics/expvar/expvar.go
@@ -30,7 +30,7 @@
 // Add implements Counter.
 func (c *Counter) Add(delta float64) { c.f.Add(delta) }
 
-// Gauge implements the gauge metric wtih an expvar float.
+// Gauge implements the gauge metric with an expvar float.
 // Label values are not supported.
 type Gauge struct {
 	f *expvar.Float
diff --git a/util/conn/manager_test.go b/util/conn/manager_test.go
index 86bddbc..5e41b31 100644
--- a/util/conn/manager_test.go
+++ b/util/conn/manager_test.go
@@ -26,7 +26,7 @@
 		t.Fatal("nil conn")
 	}
 
-	// Write and check it went thru.
+	// Write and check it went through.
 	if _, err := conn.Write([]byte{1, 2, 3}); err != nil {
 		t.Fatal(err)
 	}
@@ -55,7 +55,7 @@
 		t.Fatal("conn remained nil")
 	}
 
-	// Write and check it went thru.
+	// Write and check it went through.
 	if _, err := conn.Write([]byte{4, 5}); err != nil {
 		t.Fatal(err)
 	}