diff --git a/.gitignore b/.gitignore
index b25c15b..1f2b28d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 *~
+.idea/
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..ddca6aa
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/golang/groupcache
+
+require github.com/golang/protobuf v1.3.1
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..092b956
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
+github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
diff --git a/proto.sh b/proto.sh
new file mode 100755
index 0000000..ebdba0a
--- /dev/null
+++ b/proto.sh
@@ -0,0 +1,12 @@
+#! /bin/sh
+
+# Make sure the script fails fast.
+set -e
+set -u
+set -x
+
+PROTO_DIR=groupcachepb
+
+protoc -I=$PROTO_DIR \
+    --go_out=$PROTO_DIR \
+    $PROTO_DIR/groupcache.proto