diff --git a/src/main/java/com/vectron/fcl/types/Dic.java b/src/main/java/com/vectron/fcl/types/Dic.java
index 174cc3b..2b0eabf 100644
--- a/src/main/java/com/vectron/fcl/types/Dic.java
+++ b/src/main/java/com/vectron/fcl/types/Dic.java
@@ -1,5 +1,6 @@
 package com.vectron.fcl.types;
 
+import com.vectron.fcl.exceptions.Aborted;
 import com.vectron.fcl.exceptions.TypeMismatched;
 
 import java.util.Iterator;
@@ -82,6 +83,13 @@ public class Dic implements Obj {
         this.value.put(key, value);
     }
 
+    public void append(Obj lst) {
+        if (lst instanceof Lst && ((Lst)lst).size() == 2)
+            this.value.put(((Lst)lst).at(new Num(0)), ((Lst)lst).at(new Num(1)));
+        else
+            throw new Aborted("Expected list of size 2 when adding to a map, got: " + lst);
+    }
+
     public Obj at(Obj key) {
         return value.get(key);
     }
diff --git a/src/test/java/com/vectron/fcl/FclTest.java b/src/test/java/com/vectron/fcl/FclTest.java
index e85f287..35680d6 100644
--- a/src/test/java/com/vectron/fcl/FclTest.java
+++ b/src/test/java/com/vectron/fcl/FclTest.java
@@ -782,6 +782,7 @@ public class FclTest {
         assertEquals(3, evalPop("m size").intValue());
         assertEquals(1, evalPop("m 'a' at").intValue());
         assertEquals("b", evalPop("m 2 at").asStr().value());
+        assertEquals("#[ 'x' 'y' ]#", evalPop("<map> dup [ 'x' 'y' ] add").toString());
         assertEquals(false, evalPop("m true at").boolValue());
         assertEquals(Nil.INSTANCE, evalPop("m 'nosuch' at"));
         assertEquals(0, evalPop("m clear m size").intValue());