diff --git a/src/expr/Link.js b/src/expr/Link.js
index 813f6818c..9edaea25e 100644
--- a/src/expr/Link.js
+++ b/src/expr/Link.js
@@ -1,16 +1,16 @@
 // TODO: comment link
 
-function Link (scope, name, value) {
+math.expr.Link = function Link (scope, name, value) {
     this.scope = scope;
     this.name = name;
     this.value = value;
-}
+};
 
 /**
  * Get the links value
  * @returns {*} value
  */
-Link.prototype.get = function () {
+math.expr.Link.prototype.get = function () {
     var value = this.value;
     if (!value) {
         // try to resolve again
@@ -22,7 +22,7 @@ Link.prototype.get = function () {
     }
 
     // resolve a chain of links
-    while (value instanceof Link) {
+    while (value instanceof math.expr.Link) {
         value = value.get();
     }
 
@@ -33,6 +33,6 @@ Link.prototype.get = function () {
  * Set the value for the link
  * @param {*} value
  */
-Link.prototype.set = function (value) {
+math.expr.Link.prototype.set = function (value) {
     this.value = value;
 };
diff --git a/src/expr/Scope.js b/src/expr/Scope.js
index 554aad11a..3a7c46bb0 100644
--- a/src/expr/Scope.js
+++ b/src/expr/Scope.js
@@ -71,7 +71,7 @@ math.expr.Scope.prototype = {
     /**
      * create a symbol
      * @param {String} name
-     * @return {Link} symbol
+     * @return {math.expr.Link} symbol
      * @private
      */
     createSymbol: function (name) {
@@ -81,7 +81,7 @@ math.expr.Scope.prototype = {
             var lastDef = this.findDef(name);
 
             // create a new symbol
-            symbol = new Link(this, name, lastDef);
+            symbol = new math.expr.Link(this, name, lastDef);
             this.symbols[name] = symbol;
 
         }
@@ -91,7 +91,7 @@ math.expr.Scope.prototype = {
     /**
      * create a link to a value.
      * @param {String} name
-     * @return {Link} symbol
+     * @return {math.expr.Link} symbol
      */
     createLink: function (name) {
         var symbol = this.links[name];
@@ -107,7 +107,7 @@ math.expr.Scope.prototype = {
      * Returns the created symbol
      * @param {String} name
      * @param {*} [value]
-     * @return {Link} symbol
+     * @return {math.expr.Link} symbol
      */
     createDef: function (name, value) {
         if (this.readonly) {
@@ -129,7 +129,7 @@ math.expr.Scope.prototype = {
      * Create a variable update definition
      * Returns the created symbol
      * @param {String} name
-     * @return {Link} symbol
+     * @return {math.expr.Link} symbol
      */
     createUpdate: function (name) {
         if (this.readonly) {
@@ -148,11 +148,11 @@ math.expr.Scope.prototype = {
      * Create a constant
      * @param {String} name
      * @param {*} value
-     * @return {Link} symbol
+     * @return {math.expr.Link} symbol
      * @private
      */
     createConstant: function (name, value) {
-        var symbol = new Link(this, name, value);
+        var symbol = new math.expr.Link(this, name, value);
         this.symbols[name] = symbol;
         this.defs[name] = symbol;
         return symbol;
@@ -163,7 +163,7 @@ math.expr.Scope.prototype = {
      * If the symbol is not found in this scope, it will be looked up in its parent
      * scope.
      * @param {String} name
-     * @return {Link | undefined} symbol, or undefined when not found
+     * @return {math.expr.Link | undefined} symbol, or undefined when not found
      */
     findDef: function (name) {
         var symbol;
diff --git a/src/expr/node/Assignment.js b/src/expr/node/Assignment.js
index 7c87b3b40..fb6a0ab7f 100644
--- a/src/expr/node/Assignment.js
+++ b/src/expr/node/Assignment.js
@@ -3,7 +3,7 @@
  * @param {String} name                 Symbol name
  * @param {Node[] | undefined} params   Zero or more parameters
  * @param {Node} expr                   The expression defining the symbol
- * @param {Link} result                 placeholder for the result
+ * @param {math.expr.Link} result       placeholder for the result
  */
 function Assignment(name, params, expr, result) {
     this.name = name;
diff --git a/src/expr/node/FunctionAssignment.js b/src/expr/node/FunctionAssignment.js
index 2f71bfa5b..2b63b74bc 100644
--- a/src/expr/node/FunctionAssignment.js
+++ b/src/expr/node/FunctionAssignment.js
@@ -6,7 +6,7 @@
  * @param {String[]} variableNames  Variable names
  * @param {function[]} variables    Links to the variables in a scope
  * @param {Node} expr               The function expression
- * @param {Link} result             Link to store the result
+ * @param {math.expr.Link} result   Link to store the result
  */
 function FunctionAssignment(name, variableNames, variables, expr, result) {
     this.name = name;
diff --git a/src/expr/node/Symbol.js b/src/expr/node/Symbol.js
index b4cd22199..68f804d5f 100644
--- a/src/expr/node/Symbol.js
+++ b/src/expr/node/Symbol.js
@@ -3,7 +3,7 @@
  * A symbol can hold and evaluate a link to a value or function defined in a
  * scope.
  * @param {String} [name]
- * @param {Link} link
+ * @param {math.expr.Link} link
  * @extends {Node}
  */
 function Symbol(name, link) {