diff --git a/content/functions/delimit.md b/content/functions/delimit.md
index 3c5ffc898..9e1a6b96c 100644
--- a/content/functions/delimit.md
+++ b/content/functions/delimit.md
@@ -1,9 +1,8 @@
 ---
 title: delimit
 linktitle: delimit
-description: Loops through any array, slice, or map and returns a string of all the values separated by a delimiter."
+description: Loops through any array, slice, or map and returns a string of all the values separated by a delimiter.
 godocref:
-qref: loops through array, slice, or map and returns string of all values separated by a delimiter.
 workson: []
 date: 2017-02-01
 publishdate: 2017-02-01
diff --git a/content/functions/format.md b/content/functions/format.md
index b1de89f97..0cffd44cf 100644
--- a/content/functions/format.md
+++ b/content/functions/format.md
@@ -18,7 +18,7 @@ aliases: []
 toc: true
 ---
 
-`Format` will format date values defined in your front matter. `.Format` and can be used as a property on the following [page variables][pagevars]:
+`Format` will format date values defined in your front matter and can be used as a property on the following [page variables][pagevars]:
 
 * `.PublishDate`
 * `.Date`
@@ -30,7 +30,7 @@ Assuming a key-value of `date: 2017-03-03` in a content file's front matter, you
 {{ .PublishDate.Format "January 2, 2006" }} => March 3, 2017
 ```
 
-For formatting *any* string representations of dates defined in your front matter, see the [`dateFormat` function][dateFormat].
+For formatting *any* string representations of dates defined in your front matter, see the [`dateFormat` function][dateFormat], which will still leverage the Golang layout string explained below but uses a slightly different syntax.
 
 ## Go's Layout String
 
diff --git a/content/functions/len.md b/content/functions/len.md
new file mode 100644
index 000000000..714dc7b02
--- /dev/null
+++ b/content/functions/len.md
@@ -0,0 +1,65 @@
+---
+title: len
+linktitle: len
+description: Returns the length of a variable according to its type.
+godocref: https://golang.org/pkg/builtin/#len
+date: 2017-02-01
+publishdate: 2017-02-01
+lastmod: 2017-04-18
+categories: [functions]
+tags: []
+ns:
+signature: ["len INPUT"]
+workson: [lists,taxonomies,terms]
+hugoversion:
+relatedfuncs: []
+deprecated: false
+toc: false
+aliases: []
+---
+
+`len` is a built-in function in Golang that returns the length of a variable according to its type. From the Golang documentation:
+
+> Array: the number of elements in v.
+>
+> Pointer to array: the number of elements in *v (even if v is nil).
+>
+> Slice, or map: the number of elements in v; if v is nil, len(v) is zero.
+>
+> String: the number of bytes in v.
+>
+> Channel: the number of elements queued (unread) in the channel buffer; if v is nil, len(v) is zero.
+
+`len` is also considered a [fundamental function for Hugo templating][].
+
+## `len` Example 1: Longer Headings
+
+You may want to append a class to a heading according to the length of the string therein. The following templating checks to see if the title's length is greater than 80 characters and, if so, adds a `long-title` class to the `<h1>`:
+
+{{% code file="check-title-length.html" %}}
+```html
+<header>
+    <h1{{if gt (len .Title) 80}} class="long-title"{{end}}>{{.Title}}</h1>
+</header>
+```
+{{% /code %}}
+
+## `len` Example 2: Counting Pages with `where`
+
+The following templating uses [`where`][] in conjunction with `len` to figure out the total number of content pages in a `posts` [section][]:
+
+{{% code file="how-many-posts.html" %}}
+```html
+{{ $posts := (where .Site.RegularPages "Section" "==" "post") }}
+{{ $postCount := len $posts }}
+```
+{{% /code %}}
+
+Note the use of `.RegularPages`, a [site variable][] that counts all regular content pages but not the `_index.md` pages used to add front matter and content to [list templates][].
+
+
+[fundamental function for Hugo templating]: /templates/introduction/
+[list templates]: /templates/lists/
+[section]: /content-management/sections/
+[site variable]: /variables/site/
+[`where`]: /functions/where/
\ No newline at end of file
diff --git a/content/templates/lists.md b/content/templates/lists.md
index a83f0a1bc..af94a29c2 100644
--- a/content/templates/lists.md
+++ b/content/templates/lists.md
@@ -398,7 +398,7 @@ Hugo provides some functions for grouping pages by Section, Type, Date, etc.
 ```
 {{% /code %}}
 
-### By Page date
+### By Date
 
 {{% code file="layouts/partials/by-page-date.html" %}}
 ```html
@@ -416,7 +416,7 @@ Hugo provides some functions for grouping pages by Section, Type, Date, etc.
 ```
 {{% /code %}}
 
-### By Page publish date
+### By Publish Date
 
 {{% code file="layouts/partials/by-page-publish-date.html" %}}
 ```html
@@ -434,7 +434,7 @@ Hugo provides some functions for grouping pages by Section, Type, Date, etc.
 ```
 {{% /code %}}
 
-### By Page Param
+### By Page Parameter
 
 {{% code file="layouts/partials/by-page-param.html" %}}
 ```html
@@ -452,7 +452,9 @@ Hugo provides some functions for grouping pages by Section, Type, Date, etc.
 ```
 {{% /code %}}
 
-### By Page Param in Date Format
+### By Page Parameter in Date Format
+
+The following template takes grouping by `date` a step further and uses Golang's layout string. See the [`Format` function][] for more examples of how to format dates in Hugo.
 
 {{% code file="layouts/partials/by-page-param-as-date.html" %}}
 ```html
@@ -570,6 +572,7 @@ Using `first` and `where` together can be very powerful:
 
 [bepsays]: http://bepsays.com/en/2016/12/19/hugo-018/
 [directorystructure]: /getting-started/directory-structure/
+[`Format` function]: /functions/format/
 [homepage]: /templates/homepage/
 [homepage]: /templates/homepage/
 [limitkeyword]: https://www.techonthenet.com/sql/select_limit.php