diff --git a/_filters/size.md b/_filters/size.md
index 52d97ca..7711f14 100644
--- a/_filters/size.md
+++ b/_filters/size.md
@@ -1,3 +1,21 @@
 ---
 title: size
 ---
+
+<p>Returns the size of a string or an array.</p>
+
+
+| Code                                                   | Output             |
+|:-------------------------------------------------------|:-------------------|
+| {% raw %}`{{ 'is this a 30 character string?' | size }}`{% endraw %}     | `30` |
+
+
+`size` can be used in dot notation, in cases where it needs to be used inside a tag.
+
+<div>
+{% highlight html %}{% raw %}
+{% if collections.frontpage.products.size > 10 %}
+  There are more than 10 products in this collection!
+{% endif %}
+{% endraw %}{% endhighlight %}
+</div>
diff --git a/_filters/sort.md b/_filters/sort.md
index 1e5011c..c6805f2 100644
--- a/_filters/sort.md
+++ b/_filters/sort.md
@@ -1,3 +1,23 @@
 ---
 title: sort
 ---
+
+Sorts items in an array by a property of an item in the array. The order of the sorted array is case-sensitive.
+
+<p class="input">Input</p>
+<div>
+{% highlight html %}{% raw %}
+<!-- products = "a", "b", "A", "B" -->
+{% assign products = collection.products | sort: 'title' %}
+{% for product in products %}
+   {{ product.title }}
+{% endfor %}{% endraw %}{% endhighlight %}
+</div>
+
+<p class="output">Output</p>
+<div>
+{% highlight html %}{% raw %}
+A B a b
+{% endraw %}{% endhighlight %}
+</div>
+
diff --git a/_filters/uniq.md b/_filters/uniq.md
index 7ce25a6..84b7703 100644
--- a/_filters/uniq.md
+++ b/_filters/uniq.md
@@ -16,3 +16,4 @@ title: uniq
 orange apple banana
 {% endraw %}{% endhighlight %}</div>
 
+
diff --git a/_filters/url_encode.md b/_filters/url_encode.md
index 133ff80..989a795 100644
--- a/_filters/url_encode.md
+++ b/_filters/url_encode.md
@@ -1,3 +1,9 @@
 ---
 title: url_encode
 ---
+
+Converts any URL-unsafe characters in a string into percent-encoded characters.
+
+| Code                                                   | Output             |
+|:-------------------------------------------------------|:-------------------|
+| {% raw %}`{{ 'john@liquid.com' | url_encode }}`{% endraw %}     | `john%40liquid.com` |