diff --git a/doc/ref/api-memory.texi b/doc/ref/api-memory.texi
index ec6c705e4..01bfe81b2 100644
--- a/doc/ref/api-memory.texi
+++ b/doc/ref/api-memory.texi
@@ -296,9 +296,9 @@ they constitute a doubly-weak table has to be used.
 @node Weak hash tables
 @subsubsection Weak hash tables
 
-@deffn {Scheme Procedure} make-weak-key-hash-table size
-@deffnx {Scheme Procedure} make-weak-value-hash-table size
-@deffnx {Scheme Procedure} make-doubly-weak-hash-table size
+@deffn {Scheme Procedure} make-weak-key-hash-table [size]
+@deffnx {Scheme Procedure} make-weak-value-hash-table [size]
+@deffnx {Scheme Procedure} make-doubly-weak-hash-table [size]
 @deffnx {C Function} scm_make_weak_key_hash_table (size)
 @deffnx {C Function} scm_make_weak_value_hash_table (size)
 @deffnx {C Function} scm_make_doubly_weak_hash_table (size)
diff --git a/libguile/weak-table.c b/libguile/weak-table.c
index e91106988..4e3ed3396 100644
--- a/libguile/weak-table.c
+++ b/libguile/weak-table.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2011, 2012, 2013 Free Software Foundation, Inc.
+/* Copyright (C) 2011, 2012, 2013, 2014 Free Software Foundation, Inc.
  * 
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public License
@@ -1079,7 +1079,7 @@ SCM_DEFINE (scm_make_weak_value_hash_table, "make-weak-value-hash-table", 0, 1,
 #undef FUNC_NAME
 
 
-SCM_DEFINE (scm_make_doubly_weak_hash_table, "make-doubly-weak-hash-table", 1, 0, 0, 
+SCM_DEFINE (scm_make_doubly_weak_hash_table, "make-doubly-weak-hash-table", 0, 1, 0, 
             (SCM n),
 	    "Return a hash table with weak keys and values with @var{size}\n"
 	    "buckets.  (@pxref{Hash Tables})")