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diff --git a/examples/demo/opengl/fbm.h b/examples/demo/opengl/fbm.h
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+++ b/examples/demo/opengl/fbm.h
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+/*****************************************************************
+
+  Prototypes for the fractional Brownian motion algorithm. These
+  functions were originally the work of F. Kenton Musgrave.  For
+  documentation of the different functions please refer to the book:
+  "Texturing and modeling: a procedural approach"
+  by David S. Ebert et. al.
+  
+******************************************************************/
+
+#ifndef _fbm_h
+#define _fbm_h
+
+#include  <math.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define TRUE    1
+#define FALSE   0
+
+typedef struct {
+    double x;
+    double y;
+    double z;
+} Vector;
+    
+double fBm( Vector point, double H, double lacunarity, double octaves, 
+	    int init );
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+
+
+