diff --git a/src/namespace.js b/src/namespace.js
index ff96aada1..f1fc5f087 100644
--- a/src/namespace.js
+++ b/src/namespace.js
@@ -203,7 +203,7 @@ Namespace.prototype.get = function get(name) {
 Namespace.prototype.getEnum = function getEnum(name) {
     if (this.nested && this.nested[name] instanceof Enum)
         return this.nested[name].values;
-    throw Error("no such enum");
+    throw Error("no such enum: " + name);
 };
 
 /**
@@ -377,7 +377,7 @@ Namespace.prototype.lookup = function lookup(path, filterTypes, parentAlreadyChe
 Namespace.prototype.lookupType = function lookupType(path) {
     var found = this.lookup(path, [ Type ]);
     if (!found)
-        throw Error("no such type");
+        throw Error("no such type: " + path);
     return found;
 };