diff --git a/panda/src/pgraph/shaderAttrib.cxx b/panda/src/pgraph/shaderAttrib.cxx
index 21145802d6..29e78e9dd1 100644
--- a/panda/src/pgraph/shaderAttrib.cxx
+++ b/panda/src/pgraph/shaderAttrib.cxx
@@ -525,6 +525,28 @@ get_shader() const {
   return _shader;
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: ShaderAttrib::output
+//       Access: Public, Virtual
+//  Description:
+////////////////////////////////////////////////////////////////////
+void ShaderAttrib::
+output(ostream &out) const {
+  out << "ShaderAttrib:";
+
+  if (_has_shader) {
+    if (_shader == NULL) {
+      out << "off";
+    } else {
+      out << _shader->get_filename().get_basename();
+    }
+  } else if (_auto_shader) {
+    out << "auto";
+  }
+
+  out << "," << _inputs.size() << " inputs";
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: ShaderAttrib::compare_to_impl
 //       Access: Protected, Virtual
diff --git a/panda/src/pgraph/shaderAttrib.h b/panda/src/pgraph/shaderAttrib.h
index 5e92b71011..82f0be657a 100644
--- a/panda/src/pgraph/shaderAttrib.h
+++ b/panda/src/pgraph/shaderAttrib.h
@@ -115,6 +115,7 @@ PUBLISHED:
   static void register_with_read_factory();
 
 public:
+  virtual void output(ostream &out) const;
 
 protected:
   virtual int compare_to_impl(const RenderAttrib *other) const;