Add some "// --------" section-break comments
diff --git a/cmd/commonflags/commonflags.go b/cmd/commonflags/commonflags.go
index daf41ae..643c4ab 100644
--- a/cmd/commonflags/commonflags.go
+++ b/cmd/commonflags/commonflags.go
@@ -12,6 +12,8 @@
// See the License for the specific language governing permissions and
// limitations under the License.
+// ----------------
+
// commonflags holds flag defaults and usage messages that are common to the
// Wuffs command line tools.
//
diff --git a/cmd/wuffs-c/main.go b/cmd/wuffs-c/main.go
index 0fd731a..ae1d032 100644
--- a/cmd/wuffs-c/main.go
+++ b/cmd/wuffs-c/main.go
@@ -12,6 +12,8 @@
// See the License for the specific language governing permissions and
// limitations under the License.
+// ----------------
+
// wuffs-c handles the C language specific parts of the wuffs tool.
package main
diff --git a/cmd/wuffs/main.go b/cmd/wuffs/main.go
index f7698c4..c861cf5 100644
--- a/cmd/wuffs/main.go
+++ b/cmd/wuffs/main.go
@@ -12,6 +12,8 @@
// See the License for the specific language governing permissions and
// limitations under the License.
+// ----------------
+
// wuffs is a tool for managing Wuffs source code.
package main
diff --git a/cmd/wuffsfmt/main.go b/cmd/wuffsfmt/main.go
index 47515a5..801845b 100644
--- a/cmd/wuffsfmt/main.go
+++ b/cmd/wuffsfmt/main.go
@@ -12,6 +12,8 @@
// See the License for the specific language governing permissions and
// limitations under the License.
+// ----------------
+
// wuffsfmt formats Wuffs programs.
//
// Without explicit paths, it rewrites the standard input to standard output.
