diff --git a/go.mod b/go.mod
index 5cb1fd4..a5f6024 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
 module github.com/djherbis/nio/v3
 
 go 1.16
+
+require github.com/djherbis/buffer v1.1.0
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..f4578ad
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/djherbis/buffer v1.1.0 h1:uGQ+DZDAMlfC2z3khbBtLcAHC0wyoNrX9lpOml3g3fg=
+github.com/djherbis/buffer v1.1.0/go.mod h1:VwN8VdFkMY0DCALdY8o00d3IZ6Amz/UNVMWcSaJT44o=