diff --git a/content.go b/content.go
index b33e6b7..772a21d 100644
--- a/content.go
+++ b/content.go
@@ -134,15 +134,15 @@ func (receiver *Content) Read(p []byte) (int, error) {
 		return 0, errNilByteSlice
 	}
 
+	if receiver.Closed() {
+		return 0, errClosed
+	}
+
 	var reader io.Reader = receiver.reader
 	if nil == reader {
 		return 0, errInternalError
 	}
 
-	if receiver.Closed() {
-		return 0, nil
-	}
-
 	return receiver.reader.Read(p)
 }
 
diff --git a/errors.go b/errors.go
new file mode 100644
index 0000000..6309a23
--- /dev/null
+++ b/errors.go
@@ -0,0 +1,13 @@
+package strfs
+
+import (
+	"github.com/reiver/go-fck"
+)
+
+const (
+	errClosed        = fck.Error("closed")
+	errInternalError = fck.Error("internal error")
+	errNilByteSlice  = fck.Error("nil byte slice")
+	errNilReader     = fck.Error("nil reader")
+	errNilReceiver   = fck.Error("nil receiver")
+)