diff --git a/gee-cache/day5-multi-nodes/main.go b/gee-cache/day5-multi-nodes/main.go
index a99940c..b8677f2 100644
--- a/gee-cache/day5-multi-nodes/main.go
+++ b/gee-cache/day5-multi-nodes/main.go
@@ -73,8 +73,7 @@ func main() {
 		8003: "http://localhost:8003",
 	}
 
-	addrs := make([]string, 3)
-
+	var addrs []string
 	for _, v := range addrMap {
 		addrs = append(addrs, v)
 	}
diff --git a/gee-cache/day6-single-flight/main.go b/gee-cache/day6-single-flight/main.go
index a99940c..b8677f2 100644
--- a/gee-cache/day6-single-flight/main.go
+++ b/gee-cache/day6-single-flight/main.go
@@ -73,8 +73,7 @@ func main() {
 		8003: "http://localhost:8003",
 	}
 
-	addrs := make([]string, 3)
-
+	var addrs []string
 	for _, v := range addrMap {
 		addrs = append(addrs, v)
 	}
diff --git a/gee-cache/day7-proto-buf/main.go b/gee-cache/day7-proto-buf/main.go
index a99940c..b8677f2 100644
--- a/gee-cache/day7-proto-buf/main.go
+++ b/gee-cache/day7-proto-buf/main.go
@@ -73,8 +73,7 @@ func main() {
 		8003: "http://localhost:8003",
 	}
 
-	addrs := make([]string, 3)
-
+	var addrs []string
 	for _, v := range addrMap {
 		addrs = append(addrs, v)
 	}
diff --git a/gee-cache/doc/geecache-day5.md b/gee-cache/doc/geecache-day5.md
index 28111ae..4e28083 100644
--- a/gee-cache/doc/geecache-day5.md
+++ b/gee-cache/doc/geecache-day5.md
@@ -280,8 +280,7 @@ func main() {
 		8003: "http://localhost:8003",
 	}
 
-	addrs := make([]string, 3)
-
+	var addrs []string
 	for _, v := range addrMap {
 		addrs = append(addrs, v)
 	}