diff --git a/freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c b/freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c
index 8784759..e30e9f4 100755
--- a/freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c
+++ b/freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c
@@ -52,8 +52,9 @@
 void checkError(const char *functionName)
 {
    GLenum error;
-   while (( error = glGetError() ) != GL_NO_ERROR) {
-      fprintf (stderr, "GL error 0x%X detected in %s\n", error, functionName);
+   while (( error = glGetError() ) != GL_NO_ERROR) {
+      const GLubyte* sError = gluErrorString(error);
+      fprintf (stderr, "GL error 0x%X, %s, detected in %s\n", error, sError, functionName);
    }
 }