8 files changed, 8 insertions, 0 deletions
diff --git a/lib/rdoc/parser/c.rb b/lib/rdoc/parser/c.rb
index fd336f5f5b..cd139441ba 100644
--- a/lib/rdoc/parser/c.rb
+++ b/lib/rdoc/parser/c.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require 'tsort'
 
 ##
diff --git a/lib/rdoc/parser/changelog.rb b/lib/rdoc/parser/changelog.rb
index a3567c1f81..92c8d94ad6 100644
--- a/lib/rdoc/parser/changelog.rb
+++ b/lib/rdoc/parser/changelog.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require 'time'
 
 ##
diff --git a/lib/rdoc/parser/markdown.rb b/lib/rdoc/parser/markdown.rb
index 6fd88cf614..feffb26ced 100644
--- a/lib/rdoc/parser/markdown.rb
+++ b/lib/rdoc/parser/markdown.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 ##
 # Parse a Markdown format file.  The parsed RDoc::Markup::Document is attached
 # as a file comment.
diff --git a/lib/rdoc/parser/rd.rb b/lib/rdoc/parser/rd.rb
index 09069ae297..e6693b9ac8 100644
--- a/lib/rdoc/parser/rd.rb
+++ b/lib/rdoc/parser/rd.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 ##
 # Parse a RD format file.  The parsed RDoc::Markup::Document is attached as a
 # file comment.
diff --git a/lib/rdoc/parser/ruby.rb b/lib/rdoc/parser/ruby.rb
index ce1083edc7..ac7094f488 100644
--- a/lib/rdoc/parser/ruby.rb
+++ b/lib/rdoc/parser/ruby.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 ##
 # This file contains stuff stolen outright from:
 #
diff --git a/lib/rdoc/parser/ruby_tools.rb b/lib/rdoc/parser/ruby_tools.rb
index 654431ea30..bbca065b5e 100644
--- a/lib/rdoc/parser/ruby_tools.rb
+++ b/lib/rdoc/parser/ruby_tools.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 ##
 # Collection of methods for writing parsers against RDoc::RubyLex and
 # RDoc::RubyToken
diff --git a/lib/rdoc/parser/simple.rb b/lib/rdoc/parser/simple.rb
index 65cfc1b2e7..73bb7bdffb 100644
--- a/lib/rdoc/parser/simple.rb
+++ b/lib/rdoc/parser/simple.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 ##
 # Parse a non-source file. We basically take the whole thing as one big
 # comment.
diff --git a/lib/rdoc/parser/text.rb b/lib/rdoc/parser/text.rb
index f973313551..1a13fd1186 100644
--- a/lib/rdoc/parser/text.rb
+++ b/lib/rdoc/parser/text.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 ##
 # Indicates this parser is text and doesn't contain code constructs.
 #