diff --git a/README.md b/README.md
index 2ee5709..64059ef 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,9 @@ gënérative ȧrt made by pragmatic [micro-framework](gartwork/README.md) and 
 follow: [🎇 Instagram](https://www.instagram.com/gart_173) |
 [🎥 YouTube gallery](https://www.youtube.com/watch?v=wbcpgElKq7E&list=PLKevVk1K8oXF_GrdsGHjeOuuSkpZXq5ps)
 
+⚠️ As the library grows, it changes. Some code probably needs to be updated. I don't have time to maintain everything.
+🤷‍♂️
+
 ## 🍭 gȧlléry
 
 ⭐️ [Zen. Plasma. Watter.](arts/plasma/README.md) [🎬](https://youtu.be/wbcpgElKq7E)
diff --git a/gartwork/src/main/kotlin/dev/oblac/gart/Frames.kt b/gartwork/src/main/kotlin/dev/oblac/gart/Frames.kt
index d0f3e98..e1b3e99 100644
--- a/gartwork/src/main/kotlin/dev/oblac/gart/Frames.kt
+++ b/gartwork/src/main/kotlin/dev/oblac/gart/Frames.kt
@@ -68,6 +68,18 @@ interface Frames {
         }
     }
 
+    fun onBeforeFrame(targetFrame: Long, callback: () -> Unit) {
+        if (new && frame < targetFrame) {
+            callback()
+        }
+    }
+
+    fun onAfterFrame(targetFrame: Long, callback: () -> Unit) {
+        if (new && frame > targetFrame) {
+            callback()
+        }
+    }
+
     fun onEveryFrame(targetFrame: Long, callback: () -> Unit) {
         if (new && frame % targetFrame == 0L) {
             callback()
diff --git a/settings.gradle b/settings.gradle
index 3cc62f1..731f20c 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -19,3 +19,4 @@ include 'arts:flowforce'
 include 'arts:repetition'
 include 'arts:rects'
 include 'arts:metro'
+//include 'arts:cotton'