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diff --git a/sdk/rwsdk/include/d3d8/rpanisot.h b/sdk/rwsdk/include/d3d8/rpanisot.h
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+/**
+ * Anisotropic Texture Sampling Plugin for RenderWare.
+ */
+
+#ifndef RPANISOTPLUGIN_H
+#define RPANISOTPLUGIN_H
+
+/**
+ * \defgroup rpanisot RpAnisot
+ * \ingroup mipmapping
+ *
+ * Anisotropic Texture Sampling Plugin for RenderWare Graphics.
+ */
+
+/**
+ * \ingroup rpanisot
+ * \page rpanisotoverview RpAnisot Plugin Overview
+ *
+ * \par Requirements
+ * \li \b Headers: rwcore.h, rpworld.h, rpanisot.h
+ * \li \b Libraries: rwcore, rpworld, rpanisot
+ * \li \b Plugin \b attachments: \ref RpWorldPluginAttach, \ref RpAnisotPluginAttach
+ *
+ * \subsection anisotoverview Overview
+ * The RpAnisot plugin is used to extend an \ref RwTexture with a maximum
+ * anisotropy value that will be used when a particular texture is drawn.
+ * When textured polygons are viewed nearly edge on, for example when looking
+ * dowm a road or a football pitch, distant pixels are not sampled very well
+ * by trilinear mipmapping and the texture looks smeary.
+ * Anisotropic sampling takes additional samples, resulting in sharper looking
+ * textures.  Higher numbers of samples will produce better quality results but
+ * run slower, so should be used in moderation.
+ *
+ */
+
+#include <rwcore.h>
+
+#ifdef __cplusplus
+extern              "C"
+{
+#endif
+
+extern RwInt8      RpAnisotGetMaxSupportedMaxAnisotropy(void);
+
+extern RwTexture    *RpAnisotTextureSetMaxAnisotropy(RwTexture *tex, RwInt8 val);
+extern RwInt8       RpAnisotTextureGetMaxAnisotropy(RwTexture *tex);
+
+extern RwBool       RpAnisotPluginAttach(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif                          /* RPANISOTPLUGIN_H */