diff --git a/.gitignore b/.gitignore
index 22268fe..b041414 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 water.test
 water.test.exe
+.idea
\ No newline at end of file
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..92d21e2
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module github.com/songgao/water
+
+go 1.11
+
+require golang.org/x/sys v0.0.0-20210415045647-66c3f260301c
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..0c07c25
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+golang.org/x/sys v0.0.0-20210415045647-66c3f260301c h1:6L+uOeS3OQt/f4eFHXZcTxeZrGCuz+CLElgEBjbcTA4=
+golang.org/x/sys v0.0.0-20210415045647-66c3f260301c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=