diff --git a/README.rdoc b/README.rdoc
index 25fbb0ab..53be327d 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -59,9 +59,9 @@
 
       $ ruby calc
 
-  ... Does it works?
-  For details of Racc, see HTML documents placed under 'doc.en/'
-  and sample grammer files under 'sample/'.
+  ... Does it work?
+  For details of Racc, see HTML documents placed under 'rdoc/en/'
+  and sample grammar files under 'sample/'.
 
 
 == License
@@ -74,8 +74,8 @@
 
 == Bug Reports
 
-  Any kind of bug reports are welcome.
-  If you find a bug of Racc, please email me. Your grammer file,
+  Any kind of bug report is welcome.
+  If you find a bug of Racc, please email me. Your grammar file,
   debug output genereted by "racc -g", are helpful.
 
 
diff --git a/sample/array2.y b/sample/array2.y
index 290c4d4b..3fd603f3 100644
--- a/sample/array2.y
+++ b/sample/array2.y
@@ -1,7 +1,7 @@
 #
 #
 # Converting Array-like string into Ruby's Array, version 2.
-# This grammer uses no_result_var.
+# This grammar uses no_result_var.
 
 class ArrayParser2
   options no_result_var
diff --git a/sample/conflict.y b/sample/conflict.y
index c4b534df..26981a76 100644
--- a/sample/conflict.y
+++ b/sample/conflict.y
@@ -1,7 +1,7 @@
 #
 #
-# Example of conflicted grammer.
-# This grammer contains 1 Shift/Reduce conflict and 1 Reduce/Reduce conflict.
+# Example of conflicted grammar.
+# This grammar contains 1 Shift/Reduce conflict and 1 Reduce/Reduce conflict.
 
 class A
 rule
diff --git a/sample/lalr.y b/sample/lalr.y
index 17753f9e..c646e15d 100644
--- a/sample/lalr.y
+++ b/sample/lalr.y
@@ -1,6 +1,6 @@
 #
 #
-# This is LALR grammer, and not LL/SLR.
+# This is LALR grammar, and not LL/SLR.
 
 class A
 rule
diff --git a/sample/syntax.y b/sample/syntax.y
index b9af4aa2..dd4c6699 100644
--- a/sample/syntax.y
+++ b/sample/syntax.y
@@ -1,6 +1,6 @@
 #
 #
-# Racc syntax checker.  This grammer file generates
+# Racc syntax checker.  This grammar file generates
 # invalid ruby program, you cannot run this parser.
 
 class P
diff --git a/sample/yyerr.y b/sample/yyerr.y
index 10307d1e..6fa2faa9 100644
--- a/sample/yyerr.y
+++ b/sample/yyerr.y
@@ -1,6 +1,6 @@
 #
 #
-# Test grammer file for error handling.
+# Test grammar file for error handling.
 
 class A
 rule