diff --git a/apng_library/src/main/java/oupson/apng/chunks/Chunk.kt b/apng_library/src/main/java/oupson/apng/chunks/Chunk.kt
index 59d6864..e5dacc0 100644
--- a/apng_library/src/main/java/oupson/apng/chunks/Chunk.kt
+++ b/apng_library/src/main/java/oupson/apng/chunks/Chunk.kt
@@ -3,6 +3,7 @@ package oupson.apng.chunks
 /**
  * An interface for the png chunks
  */
+@Deprecated("Deprecated", level = DeprecationLevel.WARNING)
 interface Chunk {
     var body : ByteArray
 
diff --git a/apng_library/src/main/java/oupson/apng/chunks/IDAT.kt b/apng_library/src/main/java/oupson/apng/chunks/IDAT.kt
index dbed159..b51f283 100644
--- a/apng_library/src/main/java/oupson/apng/chunks/IDAT.kt
+++ b/apng_library/src/main/java/oupson/apng/chunks/IDAT.kt
@@ -1,7 +1,7 @@
 package oupson.apng.chunks
 
 import oupson.apng.utils.Utils
-
+@Deprecated("Deprecated", level = DeprecationLevel.WARNING)
 class IDAT : Chunk {
     @Suppress("PropertyName")
     var IDATBody: ArrayList<ByteArray> = ArrayList()
diff --git a/apng_library/src/main/java/oupson/apng/chunks/IHDR.kt b/apng_library/src/main/java/oupson/apng/chunks/IHDR.kt
index 7fe8841..bae29da 100644
--- a/apng_library/src/main/java/oupson/apng/chunks/IHDR.kt
+++ b/apng_library/src/main/java/oupson/apng/chunks/IHDR.kt
@@ -2,6 +2,7 @@ package oupson.apng.chunks
 
 import oupson.apng.utils.Utils
 
+@Deprecated("Deprecated", level = DeprecationLevel.WARNING)
 class IHDR : Chunk {
     override var body = byteArrayOf()
     var pngWidth = -1
diff --git a/apng_library/src/main/java/oupson/apng/chunks/fcTL.kt b/apng_library/src/main/java/oupson/apng/chunks/fcTL.kt
index 65c5d07..2c80897 100644
--- a/apng_library/src/main/java/oupson/apng/chunks/fcTL.kt
+++ b/apng_library/src/main/java/oupson/apng/chunks/fcTL.kt
@@ -5,6 +5,7 @@ import oupson.apng.utils.Utils.Companion.decodeBlendOp
 import oupson.apng.utils.Utils.Companion.decodeDisposeOp
 
 @Suppress("ClassName")
+@Deprecated("Deprecated", level = DeprecationLevel.WARNING)
 class fcTL : Chunk {
     override var body : ByteArray = byteArrayOf()