diff --git a/src/main/java/gr/james/sampling/SkipFunction.java b/src/main/java/gr/james/sampling/SkipFunction.java
new file mode 100644
index 0000000..860aad4
--- /dev/null
+++ b/src/main/java/gr/james/sampling/SkipFunction.java
@@ -0,0 +1,15 @@
+package gr.james.sampling;
+
+/**
+ * A skip function returns how many elements to skip.
+ */
+@Deprecated
+@FunctionalInterface
+interface SkipFunction {
+    /**
+     * Returns a {@code long} indicating how many elements the algorithm must skip.
+     *
+     * @return how many elements the algorithm must skip
+     */
+    long skip();
+}