diff --git a/genkeys.go b/genkeys.go
index 8a6cc370f..7d045df6b 100644
--- a/genkeys.go
+++ b/genkeys.go
@@ -347,7 +347,7 @@ func main() {
 	}
 
 	// Follow the standard comment rule (https://golang.org/s/generatedcode).
-	doNotEdit := "// Code generated by genkeys.go using 'go generate'. DO NOT EDIT."
+	doNotEdit := "// Code generated by genkeys.go using 'go generate'. DO NOT EDIT"
 
 	namesSet := map[string]struct{}{}
 	namesWithoutModsSet := map[string]struct{}{}
diff --git a/internal/input/keys.go b/internal/input/keys.go
index a9b15d4ca..659858f73 100644
--- a/internal/input/keys.go
+++ b/internal/input/keys.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Code generated by genkeys.go using 'go generate'. DO NOT EDIT.
+// Code generated by genkeys.go using 'go generate'. DO NOT EDIT
 
 package input
 
diff --git a/internal/input/keys_glfw.go b/internal/input/keys_glfw.go
index e41ae4182..de7d24b41 100644
--- a/internal/input/keys_glfw.go
+++ b/internal/input/keys_glfw.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Code generated by genkeys.go using 'go generate'. DO NOT EDIT.
+// Code generated by genkeys.go using 'go generate'. DO NOT EDIT
 
 // +build darwin freebsd linux windows
 // +build !js
diff --git a/internal/input/keys_js.go b/internal/input/keys_js.go
index 85599a27c..b3c5e5b3d 100644
--- a/internal/input/keys_js.go
+++ b/internal/input/keys_js.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Code generated by genkeys.go using 'go generate'. DO NOT EDIT.
+// Code generated by genkeys.go using 'go generate'. DO NOT EDIT
 
 // +build js
 
diff --git a/keys.go b/keys.go
index 8deea2658..aef42eceb 100644
--- a/keys.go
+++ b/keys.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Code generated by genkeys.go using 'go generate'. DO NOT EDIT.
+// Code generated by genkeys.go using 'go generate'. DO NOT EDIT
 
 package ebiten