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diff --git a/fltpoint.h b/fltpoint.h
index 20caa72..558ad7b 100644
--- a/fltpoint.h
+++ b/fltpoint.h
@@ -1,6 +1,12 @@
 //
-// Cross-platform floating point handling
+// Cross-platform floating point handling (fixed point handling too!)
 //
+// by James Hammons
+// (C) 2018 Underground Software
+//
+
+#ifndef __FLTPOINT_H__
+#define __FLTPOINT_H__
 
 #include <stdint.h>
 
@@ -8,3 +14,7 @@ uint32_t FloatToIEEE754(float f);
 uint64_t DoubleToIEEE754(double d);
 void DoubleToExtended(double d, uint8_t out[]);
 
+uint64_t DoubleToFixedPoint(double d, int intBits, int fracBits);
+
+#endif	// __FLTPOINT_H__
+