diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index aba78dfb56..99dcf9da65 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -67,7 +67,7 @@ module MakeMakefile
   C_EXT = %w[c m]
 
   ##
-  # Extensions for files complied with a C++ compiler
+  # Extensions for files compiled with a C++ compiler
 
   CXX_EXT = %w[cc mm cxx cpp]
   unless File.exist?(File.join(*File.split(__FILE__).tap {|d, b| b.swapcase}))
@@ -2109,7 +2109,7 @@ preload = #{defined?($preload) && $preload ? $preload.join(' ') : ''}
   end
   # :startdoc:
 
-  # creates a stub Makefile.
+  # Creates a stub Makefile.
   #
   def dummy_makefile(srcdir)
     configuration(srcdir) << <<RULES << CLEANINGS