diff --git a/docs/API.md b/docs/API.md
index 03cd438f..5505fced 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -32,11 +32,12 @@ This section of the Cyclone API is based on the [R<sup>7</sup>RS Scheme Specific
 
 Cyclone supports the following [Scheme Requests for Implementation (SRFI)](http://srfi.schemers.org/) libraries. Detailed information is available in the linked SRFI page as well as the provided Cyclone API:
 
-- [`srfi 1`](api/srfi/1.md) - [List Library](http://srfi.schemers.org/srfi-1/srfi-1.html)
+- [`srfi 1`](api/srfi/1.md) - [List library](http://srfi.schemers.org/srfi-1/srfi-1.html)
 - [`srfi 2`](api/srfi/2.md) - [`and-let*`](http://srfi.schemers.org/srfi-2/srfi-2.html)
 - [`srfi 8`](api/srfi/8.md) - [`receive`: Binding to multiple values](http://srfi.schemers.org/srfi-8/srfi-8.html) - Included as part of `scheme base`.
 - [`srfi 18`](api/srfi/18.md) - [Multithreading support](http://srfi.schemers.org/srfi-18/srfi-18.html)
 - [`srfi 27`](api/srfi/27.md) - [Sources of random bits](http://srfi.schemers.org/srfi-27/srfi-27.html)
+- [`srfi 28`](api/srfi/28.md) - [Basic format strings](http://srfi.schemers.org/srfi-28/srfi-28.html)
 - [`srfi 60`](api/srfi/60.md) - [Integers as bits](http://srfi.schemers.org/srfi-60/srfi-60.html)
 - [`srfi 69`](api/srfi/69.md) - [Basic hash tables](http://srfi.schemers.org/srfi-69/srfi-69.html)
 - [`srfi 106`](api/srfi/106.md) - [Basic socket interface](http://srfi.schemers.org/srfi-106/srfi-106.html)
@@ -44,8 +45,8 @@ Cyclone supports the following [Scheme Requests for Implementation (SRFI)](http:
 - [`srfi 113`](api/srfi/113.md) - [Sets and bags](http://srfi.schemers.org/srfi-113/srfi-113.html)
 - [`srfi 117`](api/srfi/117.md) - [Mutable queues](http://srfi.schemers.org/srfi-117/srfi-117.html)
 - [`srfi 128`](api/srfi/128.md) - [Comparators](http://srfi.schemers.org/srfi-128/srfi-128.html)
-- [`srfi 132`](api/srfi/132.md) - [Sort Libraries](http://srfi.schemers.org/srfi-132/srfi-132.html)
-- [`srfi 133`](api/srfi/133.md) - [Vector Library (R7RS-compatible)](http://srfi.schemers.org/srfi-133/srfi-133.html)
+- [`srfi 132`](api/srfi/132.md) - [Sort libraries](http://srfi.schemers.org/srfi-132/srfi-132.html)
+- [`srfi 133`](api/srfi/133.md) - [Vector library (R7RS-compatible)](http://srfi.schemers.org/srfi-133/srfi-133.html)
 
 # Cyclone Libraries
 
diff --git a/docs/api/srfi/28.md b/docs/api/srfi/28.md
new file mode 100644
index 00000000..7ba65952
--- /dev/null
+++ b/docs/api/srfi/28.md
@@ -0,0 +1,47 @@
+# SRFI 28 - Basic format strings
+
+Specifies a method of interpreting a Scheme string which contains a number of
+escape sequences, into which other data is interpolated according to the
+semantics of each sequence.
+
+See the [SRFI document][1] for more information.
+
+## Limitations
+
+Currently, this translates newline escape sequences into LF. This may cause
+issues if this is ever used on Windows (which expects CRLF instead). Given that
+Cyclone does not currently support Windows, this issue should not arise in
+practice.
+
+## Interface
+
+# format
+
+    (format format-string [obj ...])
+
+Processes ``format-string``, replacing any escape sequences in order with one or
+more characters. These characters depend on the semantics of the escape
+sequence.
+
+An 'escape sequence' is a two-character sequence in ``format-string``, where the
+first character is a tilde ('~'). The following are all of the valid escape
+codes, as well as their semantics:
+
+- ``~a``: The corresponding value is inserted into the string as if printed by
+  ``display``.
+- ``~s``: The corresponding value is inserted into the string as if printed by
+  ``write``.
+- ``~%``: A newline is inserted.
+- ``~~``: A literal tilde is inserted.
+
+``~a`` and ``~s``, when encountered, require a corresponding Scheme value to be
+present as an argument to ``format``. The values provided in ``obj ...`` are
+used by the escape sequences in order. It is an error if fewer values are
+provided than escape sequences which require them. ``~%`` and ``~~`` do not need
+a corresponding value.
+
+Example: The call ``(format "This is the ~ast example: ~s~%" 1 '(foo bar 17))``
+would produce the string ``"This is the 1st example: (foo bar 17)
+"`` (note the newline).
+
+[1]: http://srfi.schemers.org/srfi-28/srfi-28.html 
diff --git a/docs/api/srfi/60.md b/docs/api/srfi/60.md
index 387dfc0e..4d3edfb7 100644
--- a/docs/api/srfi/60.md
+++ b/docs/api/srfi/60.md
@@ -42,6 +42,8 @@ See the [SRFI document][1] for more information.
 [`list->integer`](#list-integer)
 [`booleans->integer`](#booleans-integer)
 
+## Interface
+
 # logand
 
     (logand n1 ...)