diff --git a/src/os/exec/exec.go b/src/os/exec/exec.go
index 5ef9540141e..41fbf963708 100644
--- a/src/os/exec/exec.go
+++ b/src/os/exec/exec.go
@@ -34,11 +34,13 @@ import (
 	"syscall"
 )
 
-// Error records the name of a binary that failed to be executed
-// and the reason it failed.
+// Error is returned by LookPath when it fails to classify a file as an
+// executable.
 type Error struct {
+	// Name is the file name for which the error occurred.
 	Name string
-	Err  error
+	// Err is the underlying error.
+	Err error
 }
 
 func (e *Error) Error() string {
diff --git a/src/os/exec/exec_test.go b/src/os/exec/exec_test.go
index 61ffcafcd5e..7bb230806f9 100644
--- a/src/os/exec/exec_test.go
+++ b/src/os/exec/exec_test.go
@@ -142,11 +142,11 @@ func TestCatGoodAndBadFile(t *testing.T) {
 	}
 }
 
-func TestNoExistBinary(t *testing.T) {
-	// Can't run a non-existent binary
-	err := exec.Command("/no-exist-binary").Run()
+func TestNoExistExecutable(t *testing.T) {
+	// Can't run a non-existent executable
+	err := exec.Command("/no-exist-executable").Run()
 	if err == nil {
-		t.Error("expected error from /no-exist-binary")
+		t.Error("expected error from /no-exist-executable")
 	}
 }
 
@@ -334,7 +334,7 @@ func TestPipeLookPathLeak(t *testing.T) {
 	}
 
 	for i := 0; i < 6; i++ {
-		cmd := exec.Command("something-that-does-not-exist-binary")
+		cmd := exec.Command("something-that-does-not-exist-executable")
 		cmd.StdoutPipe()
 		cmd.StderrPipe()
 		cmd.StdinPipe()
diff --git a/src/os/exec/lp_plan9.go b/src/os/exec/lp_plan9.go
index 142f87ed32b..5860cbca4d3 100644
--- a/src/os/exec/lp_plan9.go
+++ b/src/os/exec/lp_plan9.go
@@ -25,8 +25,8 @@ func findExecutable(file string) error {
 	return os.ErrPermission
 }
 
-// LookPath searches for an executable binary named file
-// in the directories named by the path environment variable.
+// LookPath searches for an executable named file in the
+// directories named by the path environment variable.
 // If file begins with "/", "#", "./", or "../", it is tried
 // directly and the path is not consulted.
 // The result may be an absolute path or a path relative to the current directory.
diff --git a/src/os/exec/lp_unix.go b/src/os/exec/lp_unix.go
index 7a302752a89..e098ff8e1d5 100644
--- a/src/os/exec/lp_unix.go
+++ b/src/os/exec/lp_unix.go
@@ -27,8 +27,8 @@ func findExecutable(file string) error {
 	return os.ErrPermission
 }
 
-// LookPath searches for an executable binary named file
-// in the directories named by the PATH environment variable.
+// LookPath searches for an executable named file in the
+// directories named by the PATH environment variable.
 // If file contains a slash, it is tried directly and the PATH is not consulted.
 // The result may be an absolute path or a path relative to the current directory.
 func LookPath(file string) (string, error) {
diff --git a/src/os/exec/lp_windows.go b/src/os/exec/lp_windows.go
index 793d4d98b3a..9ea3d765757 100644
--- a/src/os/exec/lp_windows.go
+++ b/src/os/exec/lp_windows.go
@@ -50,8 +50,8 @@ func findExecutable(file string, exts []string) (string, error) {
 	return "", os.ErrNotExist
 }
 
-// LookPath searches for an executable binary named file
-// in the directories named by the PATH environment variable.
+// LookPath searches for an executable named file in the
+// directories named by the PATH environment variable.
 // If file contains a slash, it is tried directly and the PATH is not consulted.
 // LookPath also uses PATHEXT environment variable to match
 // a suitable candidate.