diff --git a/engine/src/main/java/com/github/s4ke/moar/strings/EfficientString.java b/engine/src/main/java/com/github/s4ke/moar/strings/EfficientString.java
index 788edc8..a979747 100644
--- a/engine/src/main/java/com/github/s4ke/moar/strings/EfficientString.java
+++ b/engine/src/main/java/com/github/s4ke/moar/strings/EfficientString.java
@@ -17,7 +17,7 @@
  *
  * @author Martin Braun
  */
-public class EfficientString {
+public class EfficientString implements Comparable<EfficientString> {
 
 	private CharSeq underlying;
 	private int start;
@@ -147,4 +147,23 @@ public String toString() {
 		return this.underlying.subSequence( this.start, this.end );
 	}
 
+	@Override
+	public int compareTo(EfficientString o) {
+		//similar to Java's String comparison fn
+
+		int len1 = this.codePointLength();
+		int len2 = o.codePointLength();
+		int lim = Math.min( len1, len2 );
+
+		int k = 0;
+		while ( k < lim ) {
+			int c1 = this.codePoint( k );
+			int c2 = o.codePoint( k );
+			if ( c1 != c2 ) {
+				return c1 - c2;
+			}
+			k++;
+		}
+		return len1 - len2;
+	}
 }