diff --git a/AlgebraicDataflowArchitectureModel/src/models/algebra/Symbol.java b/AlgebraicDataflowArchitectureModel/src/models/algebra/Symbol.java
index f4f29ce..8204dea 100644
--- a/AlgebraicDataflowArchitectureModel/src/models/algebra/Symbol.java
+++ b/AlgebraicDataflowArchitectureModel/src/models/algebra/Symbol.java
@@ -4,7 +4,8 @@
 	private String name;
 	private int arity = 0;
 	private Type operatorType = Type.PREFIX;
-	private Symbol inverses[] = null;
+	private Symbol[] inverses = null;
+	private Type[] signature = null;
 	
 	public Symbol(String name) {
 		this.name = name;
@@ -50,6 +51,14 @@
 		this.inverses = inverses;
 	}
 
+	public Type[] getSignature() {
+		return signature;
+	}
+
+	public void setSignature(Type[] signature) {
+		this.signature = signature;
+	}
+
 	public boolean equals(Object another) {
 		if (!(another instanceof Symbol)) return false;
 		return name.equals(((Symbol) another).name) && arity == ((Symbol) another).arity;