--- a/tool/cmd_sdos.cpp	Wed Jul 23 08:06:10 2008 +0000
+++ b/tool/cmd_sdos.cpp	Wed Jul 23 16:16:30 2008 +0000
@@ -13,12 +13,33 @@
 
 /****************************************************************************/
 
-// FIXME
 const char *help_sdos =
     "[OPTIONS]\n"
     "\n"
+    "Displays the Sdo dictionary with Sdos and Sdo entries.\n"
     "\n"
-    "Command-specific options:\n";
+    "Sdo dictionary information is displayed in two layers, with are\n"
+    "indented accordingly:\n"
+    "\n"
+    "1) Sdos - Hexadecimal Sdo index and the name. Example:\n"
+    "\n"
+    "   Sdo 0x1018, \"Identity object\"\n"
+    "\n"
+    "2) Sdo entries - Sdo index and Sdo entry subindex (both hexadecimal)\n"
+    "   followed by the data type, the length in bit, and the description.\n"
+    "   Example:\n"
+    "\n"
+    "   0x1018:01, uint32, 32 bit, \"Vendor id\"\n"
+    "\n"
+    "If the --quiet option is given, only the Sdos are printed.\n"
+    "\n"
+    "Command-specific options:\n"
+    "  --slave -s <index>  Positive numerical ring position, or 'all' for\n"
+    "                      all slaves (default).\n"
+    "  --quiet -q          Print only Sdos (without Sdo entries).\n"
+    "\n"
+    "Numerical values can be specified either with decimal (no prefix),\n"
+    "octal (prefix '0') or hexadecimal (prefix '0x') base.\n";
 
 /****************************************************************************/