diff --git a/x0vncserver/Image.h b/x0vncserver/Image.h
index e3de17d..535cee6 100644
--- a/x0vncserver/Image.h
+++ b/x0vncserver/Image.h
@@ -38,7 +38,14 @@
   Image(Display *d, int width, int height);
   virtual ~Image();
 
-  bool isTrueColor() { return trueColor; }
+  bool isTrueColor() const { return trueColor; }
+
+  virtual const char *className() const {
+    return "Image";
+  }
+  virtual const char *classDesc() const {
+    return "basic Xlib image";
+  }
 
   virtual void get(Window wnd, int x = 0, int y = 0);
   virtual void get(Window wnd, int x, int y, int w, int h);
@@ -89,6 +96,13 @@
   ShmImage(Display *d, int width, int height);
   virtual ~ShmImage();
 
+  virtual const char *className() const {
+    return "ShmImage";
+  }
+  virtual const char *classDesc() const {
+    return "shared memory image";
+  }
+
   virtual void get(Window wnd, int x = 0, int y = 0);
   virtual void get(Window wnd, int x, int y, int w, int h);
 
@@ -118,6 +132,13 @@
   IrixOverlayShmImage(Display *d, int width, int height);
   virtual ~IrixOverlayShmImage();
 
+  virtual const char *className() const {
+    return "IrixOverlayShmImage";
+  }
+  virtual const char *classDesc() const {
+    return "IRIX-specific SHM-aware overlay image";
+  }
+
   virtual void get(Window wnd, int x = 0, int y = 0);
   virtual void get(Window wnd, int x, int y, int w, int h);
 
@@ -156,6 +177,13 @@
   SolarisOverlayImage(Display *d, int width, int height);
   virtual ~SolarisOverlayImage();
 
+  virtual const char *className() const {
+    return "SolarisOverlayImage";
+  }
+  virtual const char *classDesc() const {
+    return "Solaris-specific non-SHM overlay image";
+  }
+
   virtual void get(Window wnd, int x = 0, int y = 0);
   virtual void get(Window wnd, int x, int y, int w, int h);