diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90166cc8..c21b3b23 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 - Add `--summary-only` flag.
 - Support diffing bytecode versions for classes.
 - Support diffing Kotlin metadata versions for classes.
+- Support diffing directory entry sizes.
 
 **Changed**
 - Replace `com.jakewharton.diffuse.io.Size` with `me.saket.bytesize.ByteSize` in the APIs.
diff --git a/formats/api/formats.api b/formats/api/formats.api
index 02e95be6..8f14fa83 100644
--- a/formats/api/formats.api
+++ b/formats/api/formats.api
@@ -114,6 +114,7 @@ public final class com/jakewharton/diffuse/format/ArchiveFile$Type : java/lang/E
 	public static final field Class Lcom/jakewharton/diffuse/format/ArchiveFile$Type;
 	public static final field Companion Lcom/jakewharton/diffuse/format/ArchiveFile$Type$Companion;
 	public static final field Dex Lcom/jakewharton/diffuse/format/ArchiveFile$Type;
+	public static final field Dir Lcom/jakewharton/diffuse/format/ArchiveFile$Type;
 	public static final field JAR_TYPES Ljava/util/List;
 	public static final field Jar Lcom/jakewharton/diffuse/format/ArchiveFile$Type;
 	public static final field JarLibs Lcom/jakewharton/diffuse/format/ArchiveFile$Type;
@@ -141,6 +142,7 @@ public final class com/jakewharton/diffuse/format/ArchiveFile$Type$Companion {
 
 public final class com/jakewharton/diffuse/format/ArchiveFiles : java/util/Map, kotlin/jvm/internal/markers/KMappedMarker {
 	public static final field Companion Lcom/jakewharton/diffuse/format/ArchiveFiles$Companion;
+	public fun <init> (Ljava/util/Map;)V
 	public fun clear ()V
 	public synthetic fun compute (Ljava/lang/Object;Ljava/util/function/BiFunction;)Ljava/lang/Object;
 	public fun compute (Ljava/lang/String;Ljava/util/function/BiFunction;)Lcom/jakewharton/diffuse/format/ArchiveFile;
diff --git a/formats/src/main/kotlin/com/jakewharton/diffuse/format/ArchiveFile.kt b/formats/src/main/kotlin/com/jakewharton/diffuse/format/ArchiveFile.kt
index 9191abe8..606af0a1 100644
--- a/formats/src/main/kotlin/com/jakewharton/diffuse/format/ArchiveFile.kt
+++ b/formats/src/main/kotlin/com/jakewharton/diffuse/format/ArchiveFile.kt
@@ -42,24 +42,27 @@ class ArchiveFile(
     Res,
     Asset,
     Native,
+    Dir,
     Other;
 
     open val displayName
       get() = name.lowercase(Locale.US)
 
     companion object {
-      @JvmField val APK_TYPES = listOf(Dex, Arsc, Manifest, Res, Native, Asset, Other)
+      @JvmField val APK_TYPES = listOf(Dex, Arsc, Manifest, Res, Native, Asset, Dir, Other)
 
-      @JvmField val AAB_TYPES = listOf(Dex, Manifest, Res, Native, Asset, Other)
+      @JvmField val AAB_TYPES = listOf(Dex, Manifest, Res, Native, Asset, Dir, Other)
 
-      @JvmField val AAR_TYPES = listOf(Jar, Manifest, Res, Native, JarLibs, ApiJar, LintJar, Other)
+      @JvmField
+      val AAR_TYPES = listOf(Jar, Manifest, Res, Native, JarLibs, ApiJar, LintJar, Dir, Other)
 
-      @JvmField val JAR_TYPES = listOf(Class, Other)
+      @JvmField val JAR_TYPES = listOf(Class, Dir, Other)
 
       @JvmStatic
       @JvmName("fromApkName")
       fun String.toApkFileType() =
         when {
+          endsWith("/") -> Dir
           matches(Apk.classesDexRegex) -> Dex
           equals(AndroidManifest.NAME) -> Manifest
           equals(ArscFormat.NAME) -> Arsc
@@ -73,6 +76,7 @@ class ArchiveFile(
       @JvmName("fromAabName")
       fun String.toAabFileType() =
         when {
+          endsWith("/") -> Dir
           equals(Aab.Module.MANIFEST_FILE_PATH) -> Manifest
           startsWith("dex/") -> Dex
           startsWith("lib/") -> Native
@@ -85,6 +89,7 @@ class ArchiveFile(
       @JvmName("fromAarName")
       fun String.toAarFileType() =
         when {
+          endsWith("/") -> Dir
           equals("classes.jar") -> Jar
           equals("api.jar") -> ApiJar
           equals("lint.jar") -> LintJar
@@ -100,6 +105,7 @@ class ArchiveFile(
       @JvmName("fromJarName")
       fun String.toJarFileType() =
         when {
+          endsWith("/") -> Dir
           endsWith(".class") -> Class
           else -> Other
         }
diff --git a/formats/src/main/kotlin/com/jakewharton/diffuse/format/ArchiveFiles.kt b/formats/src/main/kotlin/com/jakewharton/diffuse/format/ArchiveFiles.kt
index e6977fdf..ec11fa9a 100644
--- a/formats/src/main/kotlin/com/jakewharton/diffuse/format/ArchiveFiles.kt
+++ b/formats/src/main/kotlin/com/jakewharton/diffuse/format/ArchiveFiles.kt
@@ -5,7 +5,7 @@ import com.jakewharton.diffuse.format.ArchiveFile.Type.Other
 import com.jakewharton.diffuse.io.Zip
 import me.saket.bytesize.binaryBytes
 
-class ArchiveFiles internal constructor(private val files: Map<String, ArchiveFile>) :
+class ArchiveFiles(private val files: Map<String, ArchiveFile>) :
   Map<String, ArchiveFile> by files {
   override fun hashCode() = files.hashCode()
 
diff --git a/reports/src/main/kotlin/com/jakewharton/diffuse/diff/ArchiveFilesDiff.kt b/reports/src/main/kotlin/com/jakewharton/diffuse/diff/ArchiveFilesDiff.kt
index ed250556..c549f204 100644
--- a/reports/src/main/kotlin/com/jakewharton/diffuse/diff/ArchiveFilesDiff.kt
+++ b/reports/src/main/kotlin/com/jakewharton/diffuse/diff/ArchiveFilesDiff.kt
@@ -96,7 +96,7 @@ internal class ArchiveFilesDiff(
 internal fun ArchiveFilesDiff.toSummaryTable(
   name: String,
   displayTypes: List<Type>,
-  skipIfEmptyTypes: Set<Type> = emptySet(),
+  skipIfEmptyTypes: Set<Type> = setOf(Type.Dir),
 ) = diffuseTable {
   header {
     if (includeCompressed) {
diff --git a/reports/src/main/kotlin/com/jakewharton/diffuse/info/ArchiveFilesInfo.kt b/reports/src/main/kotlin/com/jakewharton/diffuse/info/ArchiveFilesInfo.kt
index 8a0a9a4e..78dbd5db 100644
--- a/reports/src/main/kotlin/com/jakewharton/diffuse/info/ArchiveFilesInfo.kt
+++ b/reports/src/main/kotlin/com/jakewharton/diffuse/info/ArchiveFilesInfo.kt
@@ -11,7 +11,7 @@ import me.saket.bytesize.binaryBytes
 internal fun ArchiveFiles.toSummaryTable(
   name: String,
   displayTypes: List<ArchiveFile.Type>,
-  skipIfEmptyTypes: Set<ArchiveFile.Type> = emptySet(),
+  skipIfEmptyTypes: Set<ArchiveFile.Type> = setOf(ArchiveFile.Type.Dir),
   includeCompressed: Boolean = true,
 ) = diffuseTable {
   header {
diff --git a/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/AabInfoTextReport.kt b/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/AabInfoTextReport.kt
index ea8afaf9..21edfc98 100644
--- a/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/AabInfoTextReport.kt
+++ b/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/AabInfoTextReport.kt
@@ -44,7 +44,7 @@ internal class AabInfoTextReport(private val aab: Aab) : Report {
       module.files.toSummaryTable(
         "AAB",
         ArchiveFile.Type.AAB_TYPES,
-        skipIfEmptyTypes = setOf(ArchiveFile.Type.Native),
+        skipIfEmptyTypes = setOf(ArchiveFile.Type.Native, ArchiveFile.Type.Dir),
       )
     )
     appendLine(module.dexes.toSummaryTable())
diff --git a/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/AarDiffTextReport.kt b/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/AarDiffTextReport.kt
index 6fc27335..8102ca23 100644
--- a/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/AarDiffTextReport.kt
+++ b/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/AarDiffTextReport.kt
@@ -21,7 +21,8 @@ internal class AarDiffTextReport(private val aarDiff: AarDiff, private val summa
         aarDiff.archive.toSummaryTable(
           "AAR",
           Type.AAR_TYPES,
-          skipIfEmptyTypes = setOf(Type.JarLibs, Type.ApiJar, Type.LintJar, Type.Native, Type.Res),
+          skipIfEmptyTypes =
+            setOf(Type.JarLibs, Type.ApiJar, Type.LintJar, Type.Native, Type.Res, Type.Dir),
         )
       )
       appendLine()
diff --git a/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/AarInfoTextReport.kt b/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/AarInfoTextReport.kt
index fc40c072..6158070a 100644
--- a/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/AarInfoTextReport.kt
+++ b/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/AarInfoTextReport.kt
@@ -14,7 +14,8 @@ internal class AarInfoTextReport(private val aar: Aar) : Report {
         aar.files.toSummaryTable(
           "AAR",
           Type.AAR_TYPES,
-          skipIfEmptyTypes = setOf(Type.JarLibs, Type.ApiJar, Type.LintJar, Type.Native, Type.Res),
+          skipIfEmptyTypes =
+            setOf(Type.JarLibs, Type.ApiJar, Type.LintJar, Type.Native, Type.Res, Type.Dir),
         )
       )
       appendLine()
diff --git a/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/ApkDiffTextReport.kt b/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/ApkDiffTextReport.kt
index 36dfef51..04a174ca 100644
--- a/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/ApkDiffTextReport.kt
+++ b/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/ApkDiffTextReport.kt
@@ -53,7 +53,11 @@ internal class ApkDiffTextReport(private val apkDiff: ApkDiff, private val summa
         appendLine()
       }
       appendLine(
-        apkDiff.archive.toSummaryTable("APK", Type.APK_TYPES, skipIfEmptyTypes = setOf(Type.Native))
+        apkDiff.archive.toSummaryTable(
+          "APK",
+          Type.APK_TYPES,
+          skipIfEmptyTypes = setOf(Type.Native, Type.Dir),
+        )
       )
       appendLine()
       appendLine(apkDiff.dex.toSummaryTable())
diff --git a/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/ApkInfoTextReport.kt b/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/ApkInfoTextReport.kt
index c798dc9f..80843aa5 100644
--- a/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/ApkInfoTextReport.kt
+++ b/reports/src/main/kotlin/com/jakewharton/diffuse/report/text/ApkInfoTextReport.kt
@@ -19,7 +19,7 @@ class ApkInfoTextReport(private val apk: Apk) : Report {
         apk.files.toSummaryTable(
           "APK",
           ArchiveFile.Type.APK_TYPES,
-          skipIfEmptyTypes = setOf(ArchiveFile.Type.Native),
+          skipIfEmptyTypes = setOf(ArchiveFile.Type.Native, ArchiveFile.Type.Dir),
         )
       )
       appendLine()
diff --git a/reports/src/test/kotlin/com/jakewharton/diffuse/ArchiveFilesDiffTest.kt b/reports/src/test/kotlin/com/jakewharton/diffuse/ArchiveFilesDiffTest.kt
new file mode 100644
index 00000000..3e820edc
--- /dev/null
+++ b/reports/src/test/kotlin/com/jakewharton/diffuse/ArchiveFilesDiffTest.kt
@@ -0,0 +1,91 @@
+package com.jakewharton.diffuse
+
+import assertk.assertThat
+import assertk.assertions.isEqualTo
+import com.jakewharton.diffuse.diff.ArchiveFilesDiff
+import com.jakewharton.diffuse.diff.toSummaryTable
+import com.jakewharton.diffuse.format.ArchiveFile
+import com.jakewharton.diffuse.format.ArchiveFile.Type
+import com.jakewharton.diffuse.format.ArchiveFiles
+import me.saket.bytesize.binaryBytes
+import org.junit.Test
+
+class ArchiveFilesDiffTest {
+  @Test
+  fun summaryTableWithDirType() {
+    val base =
+      mapOf(
+        "com/example/Main.class" to
+          ArchiveFile(
+            "com/example/Main.class",
+            Type.Class,
+            100.binaryBytes,
+            200.binaryBytes,
+            true,
+          ),
+        "META-INF/MANIFEST.MF" to
+          ArchiveFile("META-INF/MANIFEST.MF", Type.Other, 30.binaryBytes, 40.binaryBytes, true),
+      )
+    val oldFiles =
+      ArchiveFiles(
+        base +
+          mapOf(
+            "com/example/" to
+              ArchiveFile("com/example/", Type.Dir, 50.binaryBytes, 0.binaryBytes, true)
+          )
+      )
+    val newFiles = ArchiveFiles(base)
+    val diff = ArchiveFilesDiff(oldFiles, newFiles)
+    val table = diff.toSummaryTable("JAR", Type.JAR_TYPES)
+    assertThat(table)
+      .isEqualTo(
+        """
+        |       │      compressed       │     uncompressed     
+        |       ├───────┬───────┬───────┼───────┬───────┬──────
+        | JAR   │ old   │ new   │ diff  │ old   │ new   │ diff 
+        |───────┼───────┼───────┼───────┼───────┼───────┼──────
+        | class │ 100 B │ 100 B │   0 B │ 200 B │ 200 B │  0 B 
+        |   dir │  50 B │   0 B │ -50 B │   0 B │   0 B │  0 B 
+        | other │  30 B │  30 B │   0 B │  40 B │  40 B │  0 B 
+        |───────┼───────┼───────┼───────┼───────┼───────┼──────
+        | total │ 180 B │ 130 B │ -50 B │ 240 B │ 240 B │  0 B 
+        """
+          .trimMargin()
+      )
+  }
+
+  @Test
+  fun summaryTableSkipsEmptyDirType() {
+    val base =
+      mapOf(
+        "com/example/Main.class" to
+          ArchiveFile(
+            "com/example/Main.class",
+            Type.Class,
+            100.binaryBytes,
+            200.binaryBytes,
+            true,
+          ),
+        "META-INF/MANIFEST.MF" to
+          ArchiveFile("META-INF/MANIFEST.MF", Type.Other, 30.binaryBytes, 40.binaryBytes, true),
+      )
+    val oldFiles = ArchiveFiles(base)
+    val newFiles = ArchiveFiles(base)
+    val diff = ArchiveFilesDiff(oldFiles, newFiles)
+    val table = diff.toSummaryTable("JAR", Type.JAR_TYPES)
+    assertThat(table)
+      .isEqualTo(
+        """
+        |       │      compressed      │     uncompressed     
+        |       ├───────┬───────┬──────┼───────┬───────┬──────
+        | JAR   │ old   │ new   │ diff │ old   │ new   │ diff 
+        |───────┼───────┼───────┼──────┼───────┼───────┼──────
+        | class │ 100 B │ 100 B │  0 B │ 200 B │ 200 B │  0 B 
+        | other │  30 B │  30 B │  0 B │  40 B │  40 B │  0 B 
+        |───────┼───────┼───────┼──────┼───────┼───────┼──────
+        | total │ 130 B │ 130 B │  0 B │ 240 B │ 240 B │  0 B 
+        """
+          .trimMargin()
+      )
+  }
+}