diff --git a/source/documents/scripts/services/reader/_factory.js.coffee b/source/documents/scripts/services/reader/_factory.js.coffee
index e4d4008..9f224ce 100644
--- a/source/documents/scripts/services/reader/_factory.js.coffee
+++ b/source/documents/scripts/services/reader/_factory.js.coffee
@@ -1,4 +1,8 @@
 angular.module("sideBySide").factory("readerFactory", ($injector) ->
+	# Create poem reader based on file name
+	#
+	# @param [String] Source file name
+	# @return [Object] Reader
 	return (filename) ->
 		extension = filename.split(".").pop()
 		switch extension
diff --git a/source/documents/scripts/services/reader/json.js.coffee b/source/documents/scripts/services/reader/json.js.coffee
index 67d8ee6..8948562 100644
--- a/source/documents/scripts/services/reader/json.js.coffee
+++ b/source/documents/scripts/services/reader/json.js.coffee
@@ -1,4 +1,11 @@
 angular.module("sideBySide").factory("jsonReader", () ->
+	# Read json poem
+	#
+	# For sample input, see:
+	# source/documents/tests/services/reader/json.js.coffee
+	#
+	# @param source [String] Json poem
+	# @return [Object] Poem object
 	return (source) ->
 		parsed = eval('(' + source + ')')
 
diff --git a/source/documents/scripts/services/reader/markdown.js.coffee b/source/documents/scripts/services/reader/markdown.js.coffee
index cc2d1ef..d758796 100644
--- a/source/documents/scripts/services/reader/markdown.js.coffee
+++ b/source/documents/scripts/services/reader/markdown.js.coffee
@@ -1,22 +1,42 @@
 angular.module("sideBySide").factory("markdownReader", () ->
+	# Read markdown poem
+	#
+	# For sample input, see:
+	# source/documents/tests/services/reader/markdown.js.coffee
+	#
+	# @param source [String] Markdown poem
+	# @return [Object] Poem object
 	return (source) ->
-		readMeta = (block, inlineLexer) ->
+		# Read meta information from markdown block
+		#
+		# @param block [string] Meta block
+		# @param inlineLexer [Object] Inline markdown lexer
+		# @return [Object] Meta properties
+		readMeta = (text, inlineLexer) ->
 			meta = {}
-			lexed = inlineLexer.output(block.text)
+			lexed = inlineLexer.output(text)
 			for line in lexed.split("\n")
 				match = /([^:]*):(.*)/.exec(line)
 				meta[match[1].trim()] = match[2].trim()
 			return meta
 
-		readContent = (lexed) ->
-			getSection = (lexed) ->
-				items = []
-				while lexed.length > 0
-					if lexed[0]["type"] == "heading"
-						break
-					items.push(lexed.shift())
-				return items
+		# Read and remove one section from start of lexed blocks
+		#
+		# @param lexed [Array] Lexed blocks
+		# @return [Array] Section
+		readSection = (lexed) ->
+			items = []
+			while lexed.length > 0
+				if lexed[0]["type"] == "heading"
+					break
+				items.push(lexed.shift())
+			return items
 
+		# Read content from lexed blocks
+		#
+		# @param lexed [Array] Lexed blocks
+		# @return [Array] Content
+		readContent = (lexed) ->
 			content = []
 
 			while lexed.length > 0
@@ -25,7 +45,7 @@ angular.module("sideBySide").factory("markdownReader", () ->
 				else
 					heading = ''
 
-				text = getSection(lexed)
+				text = readSection(lexed)
 				text.links = lexed.links
 				content.push({
 					section: heading
@@ -39,7 +59,7 @@ angular.module("sideBySide").factory("markdownReader", () ->
 		inlineLexer = new marked.InlineLexer(lexed.links)
 
 		return {
-			meta: readMeta(meta, inlineLexer)
+			meta: readMeta(meta.text, inlineLexer)
 			content: readContent(lexed)
 		}
 )