diff --git a/srfi-133.html b/srfi-133.html
index c296b93..431ee69 100644
--- a/srfi-133.html
+++ b/srfi-133.html
@@ -1464,7 +1464,7 @@ <h2><a name="Iteration">5.4. Iteration</a></h2>
     <dl>
       <dt class="proc-spec">
         <a name="vector-cumulate">
-          (vector-cumulate <i>f vec knil</i>)
+          (vector-cumulate <i>f knil vec</i>)
           -&gt; vector
         </a>
       </dt>
diff --git a/vectors/vectors-impl.scm b/vectors/vectors-impl.scm
index 9eaabd0..9b798e0 100644
--- a/vectors/vectors-impl.scm
+++ b/vectors/vectors-impl.scm
@@ -917,13 +917,13 @@
                                           vector-count)
                         (cons vec vectors)))))
 
-;;; (VECTOR-CUMULATE <f> <vector> <knil>)
+;;; (VECTOR-CUMULATE <f> <knil> <vector>)
 ;;;       -> vector
 ;;;   Returns a <new>ly allocated vector <new> with the same length as
 ;;;   <vec>. Each element <i> of <new> is set to the result of invoking <f> on
 ;;;   <new>[i-1] and <vec>[i], except that for the first call on <f>, the first
 ;;;   argument is <knil>. The <new> vector is returned.
-(define (vector-cumulate f vec knil)
+(define (vector-cumulate f knil vec)
   (let* ((len (vector-length vec))
          (result (make-vector len)))
     (let loop ((i 0) (left knil))