diff --git a/doc/efun/traceprefix b/doc/efun/traceprefix
new file mode 100644
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+++ b/doc/efun/traceprefix
@@ -0,0 +1,25 @@
+SYNOPSIS:
+        string traceprefix(string prefix)
+        string traceprefix(int dummy)
+
+DESCRIPTION:
+        If called with a string, only objects matching this prefix will
+        be traced. The string must not contain a leading "/" because
+        the object names are stored internally without it. If called
+        with a number, the traceprefix will be ignored and all objects
+        will be traced. Returns the last traceprefix or 0 if there
+        wasn't any.
+
+EXAMPLE:
+        object obj;
+        string prefix;
+        obj = find_player("deepthought");
+        prefix = object_name(obj);
+        prefix = prefix[1..strlen(prefix)-1]; /* cut off the leading "/" */
+        traceprefix(prefix);
+        trace(1|2|4|8);
+        ...
+        trace(0);
+        
+SEE ALSO:
+        trace(E)