diff --git a/src/PkgTemplates.jl b/src/PkgTemplates.jl
index 3e67469..fe4bc4a 100644
--- a/src/PkgTemplates.jl
+++ b/src/PkgTemplates.jl
@@ -28,8 +28,6 @@ export
     Tests,
     TravisCI
 
-const DEFAULT_VERSION = VersionNumber(VERSION.major)
-
 """
 A plugin to be added to a [`Template`](@ref), which adds some functionality or integration.
 """
diff --git a/src/generate.jl b/src/generate.jl
index 276f1b3..3e7f9ce 100644
--- a/src/generate.jl
+++ b/src/generate.jl
@@ -16,8 +16,7 @@ function (t::Template)(pkg::AbstractString)
         if !isempty(t.authors)
             path = joinpath(pkg_dir, "Project.toml")
             toml = TOML.parsefile(path)
-            # TODO: authors should probably be kept as a vector.
-            toml["authors"] = split(t.authors, ",")
+            toml["authors"] = t.authors
             get!(toml, "compat", Dict())["julia"] = compat_version(t.julia_version)
             open(io -> TOML.print(io, toml), path, "w")
         end
diff --git a/src/interactive.jl b/src/interactive.jl
index 230393c..c6d5f67 100644
--- a/src/interactive.jl
+++ b/src/interactive.jl
@@ -1,3 +1,5 @@
+# TODO ::IO APIs for easier testing
+
 # Printing utils.
 const TAB = repeat(' ', 4)
 const HALFTAB = repeat(' ', 2)
diff --git a/src/licenses.jl b/src/licenses.jl
deleted file mode 100644
index e69de29..0000000
diff --git a/src/plugin.jl b/src/plugin.jl
index 9abb6b6..bf872fe 100644
--- a/src/plugin.jl
+++ b/src/plugin.jl
@@ -1,13 +1,20 @@
 const DEFAULTS_DIR = normpath(joinpath(@__DIR__, "..", "defaults"))
 
+"""
+A simple plugin that, in general, manages a single file.
+For example, most CI services reply on one configuration file.
+
+TODO: Dev guide.
+"""
 abstract type BasicPlugin <: Plugin end
 
+# Compute the path to a default template file in this repository.
 default_file(paths::AbstractString...) = joinpath(DEFAULTS_DIR, paths...)
 
 """
     view(::Plugin, ::Template, pkg::AbstractString) -> Dict{String}
 
-Return extra string substitutions to be made for this plugin.
+Return the string replacements to be made for this plugin.
 """
 view(::Plugin, ::Template, ::AbstractString) = Dict{String, Any}()
 
@@ -67,25 +74,23 @@ function badges(p::Plugin, t::Template, pkg_name::AbstractString)
 end
 
 """
-    gen_plugin(p::Plugin, t::Template, pkg::AbstractString) -> Nothing
+    gen_plugin(p::Plugin, t::Template, pkg::AbstractString)
 
 Generate any files associated with a plugin.
-
-## Arguments
-* `p::Plugin`: Plugin whose files are being generated.
-* `t::Template`: Template configuration.
-* `pkg::AbstractString`: Name of the package.
+`pkg` is the name of the package being generated.
 """
 gen_plugin(::Plugin, ::Template, ::AbstractString) = nothing
 
 function gen_plugin(p::BasicPlugin, t::Template, pkg::AbstractString)
-    source(p) === nothing && return
-    text = render(source(p), view(p, t, pkg); tags=tags(p))
-    gen_file(joinpath(t.dir, pkg_name, destination(p)), text)
+    src = source(p)
+    src === nothing && return
+    # TODO template rendering code
+    text = render(src, view(p, t, pkg); tags=tags(p))
+    gen_file(joinpath(t.dir, pkg, destination(p)), text)
 end
 
 """
-    gen_file(file::AbstractString, text::AbstractString) -> Int
+    gen_file(file::AbstractString, text::AbstractString)
 
 Create a new file containing some given text.
 Trailing whitespace is removed, and the file will end with a newline.
@@ -97,6 +102,8 @@ function gen_file(file::AbstractString, text::AbstractString)
     write(file, text)
 end
 
+# TODO pls make me better
+
 render_file(file::AbstractString, view, tags) = render_text(read(file, String), view, tags)
 
 render_text(text::AbstractString, view, tags) = render(text, view; tags=tags)
@@ -120,6 +127,7 @@ const BADGE_ORDER = [
     TravisCI,
     AppVeyor,
     GitLabCI,
+    CirrusCI,
     Codecov,
     Coveralls,
 ]
diff --git a/src/plugins/citation.jl b/src/plugins/citation.jl
index 8d3e2a4..82e2708 100644
--- a/src/plugins/citation.jl
+++ b/src/plugins/citation.jl
@@ -15,7 +15,7 @@ source(p::Citation) = p.file
 destination(::Citation) = "CITATION.bib"
 
 view(::Citation, t::Template, pkg::AbstractString) = Dict(
-    "AUTHORS" => t.authors,
+    "AUTHORS" => join(t.authors, ", "),
     "MONTH" => month(today()),
     "PKG" => pkg,
     "URL" => "https://$(t.host)/$(t.user)/$pkg.jl",
diff --git a/src/plugins/documenter.jl b/src/plugins/documenter.jl
index 5b6c019..064c98c 100644
--- a/src/plugins/documenter.jl
+++ b/src/plugins/documenter.jl
@@ -60,7 +60,7 @@ badges(::Documenter{GitLabCI}) = Badge(
 
 view(p::Documenter, t::Template, pkg::AbstractString) = Dict(
     "ASSETS" => p.assets,
-    "AUTHORS" => t.authors,
+    "AUTHORS" => join(t.authors, ", "),
     "CANONICAL" => p.canonical_url === nothing ? nothing : p.canonical_url(t, pkg),
     "HAS_ASSETS" => !isempty(p.assets),
     "MAKEDOCS_KWARGS" => map((k, v) -> k => repr(v), collect(p.makedocs_kwargs)),
diff --git a/src/plugins/essentials.jl b/src/plugins/essentials.jl
index e0db4fd..5b43a44 100644
--- a/src/plugins/essentials.jl
+++ b/src/plugins/essentials.jl
@@ -63,9 +63,10 @@ end
 read_license(license::AbstractString) = string(readchomp(license_path(license)))
 
 function render_plugin(p::License, t::Template)
-    text = "Copyright (c) $(year(today())) $(t.authors)\n"
-    license = read(p.path, String)
-    startswith(license, "\n") || (text *= "\n")
+    date = year(today())
+    authors = join(t.authors, ", ")
+    text = "Copyright (c) $date $authors\n\n"
+    license = strip(read(p.path, String))
     return text * license
 end
 
diff --git a/src/template.jl b/src/template.jl
index 8fa59c7..98628ee 100644
--- a/src/template.jl
+++ b/src/template.jl
@@ -1,4 +1,4 @@
-default_version() = VersionNumber(VERSION.major)
+const DEFAULT_VERSION = VersionNumber(VERSION.major)
 
 """
     Template(interactive::Bool=false; kwargs...) -> Template
@@ -34,7 +34,7 @@ Records common information used to generate a package.
 struct Template
     user::String
     host::String
-    authors::String
+    authors::Vector{String}
     dir::String
     julia_version::VersionNumber
     ssh::Bool
@@ -46,6 +46,7 @@ end
 
 Template(; interactive::Bool=false, kwargs...) = make_template(Val(interactive); kwargs...)
 
+# Non-interactive Template constructor.
 function make_template(::Val{false}; kwargs...)
     user = getkw(kwargs, :user)
     if isempty(user)
@@ -56,7 +57,7 @@ function make_template(::Val{false}; kwargs...)
     host = URI(occursin("://", host) ? host : "https://$host").host
 
     authors = getkw(kwargs, :authors)
-    authors isa Vector && (authors = join(authors, ", "))
+    authors isa Vector || (authors = map(strip, split(authors, ",")))
 
     dir = abspath(expanduser(getkw(kwargs, :dir)))
 
@@ -82,10 +83,13 @@ function make_template(::Val{false}; kwargs...)
     )
 end
 
+# Does the template have a plugin of this type? Subtypes count too.
 hasplugin(t::Template, ::Type{T}) where T <: Plugin = any(U -> U <: T, keys(t.plugins))
 
+# Get a keyword, or compute some default value.
 getkw(kwargs, k) = get(() -> defaultkw(k), kwargs, k)
 
+# Default Template keyword values.
 defaultkw(s::Symbol) = defaultkw(Val(s))
 defaultkw(::Val{:user}) = LibGit2.getconfig("github.user", "")
 defaultkw(::Val{:host}) = "https://github.com"
@@ -103,5 +107,5 @@ function defaultkw(::Val{:authors})
     isempty(name) && return ""
     author = name * " "
     isempty(email) || (author *= "<$email>")
-    return strip(author)
+    return [strip(author)]
 end