diff --git a/reference/ds/ds/map/slice.xml b/reference/ds/ds/map/slice.xml
index 6ad614724f..307298b9e8 100644
--- a/reference/ds/ds/map/slice.xml
+++ b/reference/ds/ds/map/slice.xml
@@ -5,7 +5,7 @@
  <refnamediv>
   <refname>Ds\Map::slice</refname>
   <refpurpose>
-    Returns a subset of the map defined by a starting index and length.
+   Returns a subset of the map defined by a starting index and length.
   </refpurpose>
  </refnamediv>
 
@@ -14,7 +14,7 @@
   <methodsynopsis>
    <modifier>public</modifier> <type>Ds\Map</type><methodname>Ds\Map::slice</methodname>
    <methodparam><type>int</type><parameter>index</parameter></methodparam>
-   <methodparam choice="opt"><type>array</type><parameter>length</parameter></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>length</parameter></methodparam>
   </methodsynopsis>
   <para>
     Returns a subset of the map defined by a starting <parameter>index</parameter> and <parameter>length</parameter>.
diff --git a/reference/ds/ds/sequence/slice.xml b/reference/ds/ds/sequence/slice.xml
index 19d7d57fca..47e3f48665 100644
--- a/reference/ds/ds/sequence/slice.xml
+++ b/reference/ds/ds/sequence/slice.xml
@@ -5,7 +5,7 @@
  <refnamediv>
   <refname>Ds\Sequence::slice</refname>
   <refpurpose>
-    Returns a sub-sequence of a given range.
+   Returns a sub-sequence of a given range.
   </refpurpose>
  </refnamediv>
 
@@ -14,7 +14,7 @@
   <methodsynopsis>
    <modifier>abstract</modifier> <modifier>public</modifier> <type>Ds\Sequence</type><methodname>Ds\Sequence::slice</methodname>
    <methodparam><type>int</type><parameter>index</parameter></methodparam>
-   <methodparam choice="opt"><type>array</type><parameter>length</parameter></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>length</parameter></methodparam>
   </methodsynopsis>
   <para>
     Creates a sub-sequence of a given range.
diff --git a/reference/ds/ds/set/slice.xml b/reference/ds/ds/set/slice.xml
index 32991d1f15..fa5aa89631 100644
--- a/reference/ds/ds/set/slice.xml
+++ b/reference/ds/ds/set/slice.xml
@@ -5,7 +5,7 @@
  <refnamediv>
   <refname>Ds\Set::slice</refname>
   <refpurpose>
-    Returns a sub-set of a given range.
+   Returns a sub-set of a given range.
   </refpurpose>
  </refnamediv>
 
@@ -14,7 +14,7 @@
   <methodsynopsis>
    <modifier>public</modifier> <type>Ds\Set</type><methodname>Ds\Set::slice</methodname>
    <methodparam><type>int</type><parameter>index</parameter></methodparam>
-   <methodparam choice="opt"><type>array</type><parameter>length</parameter></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>length</parameter></methodparam>
   </methodsynopsis>
   <para>
     Creates a sub-set of a given range.
diff --git a/reference/ds/ds/vector/slice.xml b/reference/ds/ds/vector/slice.xml
index 98d33fc133..49e69fe03a 100644
--- a/reference/ds/ds/vector/slice.xml
+++ b/reference/ds/ds/vector/slice.xml
@@ -5,7 +5,7 @@
  <refnamediv>
   <refname>Ds\Vector::slice</refname>
   <refpurpose>
-    Returns a sub-vector of a given range.
+   Returns a sub-vector of a given range.
   </refpurpose>
  </refnamediv>
 
@@ -14,7 +14,7 @@
   <methodsynopsis>
    <modifier>public</modifier> <type>Ds\Vector</type><methodname>Ds\Vector::slice</methodname>
    <methodparam><type>int</type><parameter>index</parameter></methodparam>
-   <methodparam choice="opt"><type>array</type><parameter>length</parameter></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>length</parameter></methodparam>
   </methodsynopsis>
   <para>
     Creates a sub-vector of a given range.