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diff --git a/doc/api.texi b/doc/api.texi
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@@ -1,10 +1,10 @@
@menu
* Kernel:: The fundamental components.
-* Math:: Linear algebra, spatial partitioning, and more.
+* Math:: Vectors, matrices, bounding boxes, and more.
* Graphics:: 2D and 3D rendering.
* Audio:: Make some noise.
* Scripting:: Bringing the game world to life.
-* Data Structures:: Spatial partitioning and more.
+* Data Structures:: Queues, heaps, spatial partitioning, and more.
@end menu
@node Kernel
@@ -5210,11 +5210,159 @@ Clear all messages and scripts awaiting messages in @var{channel}.
@section Data Structures
@menu
+* Array Lists:: Dynamically expanding vectors.
+* Queues:: First-in, first-out data structure.
+* Heaps:: Binary heaps.
* Quadtrees:: Spatial partitioning with recursive subdivision.
* Grids:: Spatial partitioning with a fixed grid.
* Path Finding:: Generic A* path finding.
@end menu
+@node Array Lists
+@subsection Array Lists
+
+The @code{(chickadee data array-list)} module provides an array/vector
+that dynamically expands to hold all of the data that is added to it.
+It is named after the @code{ArrayList} class in Java.
+
+In addition to being used as a dynamic vector, it can also be used as
+a stack via the @code{array-list-push!} and @var{array-list-pop!}
+procedures.
+
+@deffn {Procedure} make-array-list [initial-capacity]
+Return a new empty array list with an initial capacity of
+@var{initial-capacity}, or 32 by default.
+@end deffn
+
+@deffn {Procedure} array-list items ...
+Return a new array list with @var{items} in it.
+@end deffn
+
+@deffn {Procedure} array-list? obj
+Return @code{#t} if @var{obj} is an array list.
+@end deffn
+
+@deffn {Procedure} array-list-empty? array-list
+Return @code{#t} if @var{array-list} is empty.
+@end deffn
+
+@deffn {Procedure} array-list-size array-list
+Return the current size of @var{array-list}.
+@end deffn
+
+@deffn {Procedure} array-list-ref array-list i
+Return the item in @var{array-list} at index @var{i}.
+@end deffn
+
+@deffn {Procedure} array-list-set! array-list i value
+Set the value in @var{array-list} at index @var{i} to @var{value}.
+@end deffn
+
+@deffn {Procedure} array-list-push! array-list item
+Append @var{item} to @var{array-list}.
+@end deffn
+
+@deffn {Procedure} array-list-pop! array-list
+Remove and return the last object in @var{array-list}.
+@end deffn
+
+@deffn {Procedure} array-list-delete! array-list item [#:equal? equal?] [#:fast? #f]
+Delete @var{item} from @var{array-list}. Use @var{equal?} as the
+equivalence predicate, which defaults to Guile's @code{equal?}
+procedure. By default, deletion preserves the order of the array, but
+takes linear time in the worst case. If @var{fast?} is @code{#t} then
+@var{item} will deleted in constant time, but order is not preserved.
+@end deffn
+
+@deffn {Procedure} array-list-clear! array-list
+Remove all items from @var{array-list}.
+@end deffn
+
+@deffn {Procedure} array-list-for-each proc array-list
+Apply PROC with each item in @var{array-list}.
+@end deffn
+
+@deffn {Procedure} array-list-fold proc init array-list
+Apply @var{proc} to all items in @var{array-list} to build a result and
+return that result. @var{init} is the initial result. If there are
+no objects in the vicinity of @var{rect}, just @var{init} is returned.
+@end deffn
+
+@node Queues
+@subsection Queues
+
+The @code{(chickadee data queue)} module provides a mutable queue that
+is more memory efficient than Guile's built-in @code{(ice-9 q)}
+module.
+
+@deffn {Procedure} make-queue
+Return a new, empty queue.
+@end deffn
+
+@deffn {Procedure} queue? obj
+Return @code{#t} if @var{obj} is a queue.
+@end deffn
+
+@deffn {Procedure} queue-empty? queue
+Return @code{#t} if @var{queue} is empty.
+@end deffn
+
+@deffn {Procedure} queue-length queue
+Return the current length of @var{queue}.
+@end deffn
+
+@deffn {Procedure} enqueue! queue item
+Add @var{item} to @var{queue}.
+@end deffn
+
+@deffn {Procedure} dequeue! queue
+Remove and return the first item in @var{queue}.
+@end deffn
+
+@deffn {Procedure} queue-clear! queue
+Remove all items from @var{queue}.
+@end deffn
+
+@node Heaps
+@subsection Heaps
+
+The @code{(chickadee data heap)} module provides a binary heap data
+structure. The heap orders data from smallest to largest, according
+to a custom comparison predicate, making it a good choice for priority
+queues.
+
+@deffn {Procedure} make-heap [#:< <]
+Return a new heap that uses the predicate @var{<} to determine order.
+@end deffn
+
+@deffn {Procedure} heap? obj
+Return @code{#t} if @var{obj} is a heap.
+@end deffn
+
+@deffn {Procedure} heap-empty? heap
+Return @code{#t} if @var{heap} is empty.
+@end deffn
+
+@deffn {Procedure} heap-size heap
+Return the current size of @var{heap}.
+@end deffn
+
+@deffn {Procedure} heap-min heap
+Return the minimum item in @var{heap}.
+@end deffn
+
+@deffn {Procedure} heap-insert! heap item
+Add @var{item} to @var{heap}.
+@end deffn
+
+@deffn {Procedure} heap-remove! heap
+Remove the minimum item in @var{heap}.
+@end deffn
+
+@deffn {Procedure} heap-clear! heap
+Remove all items from @var{heap}.
+@end deffn
+
@node Quadtrees
@subsection Quadtrees