diff --git a/data/data.go b/data/data.go
index 9e99b3b..8ae7cb1 100644
--- a/data/data.go
+++ b/data/data.go
@@ -1,3 +1,4 @@
+// Package data provides operations to deal with arbitrary data and MIME types.
 package data
 
 import "io"
diff --git a/default/font/defaultfont.go b/default/font/defaultfont.go
index 2cffbcf..cb229be 100644
--- a/default/font/defaultfont.go
+++ b/default/font/defaultfont.go
@@ -1,3 +1,4 @@
+// Package font provides a default font. Its data is entirely self contained.
 package font
 
 import "golang.org/x/image/font/basicfont"
diff --git a/layouts/doc.go b/layouts/doc.go
new file mode 100644
index 0000000..bd7126c
--- /dev/null
+++ b/layouts/doc.go
@@ -0,0 +1,2 @@
+// Package layouts provides a set of pre-made layouts.
+package layouts