diff --git a/hash.c b/hash.c
index 4fd2dd0a07..270553005f 100644
--- a/hash.c
+++ b/hash.c
@@ -613,6 +613,7 @@ rb_hash_key(hash, value)
     return args[1];
 }
 
+/* :nodoc: */
 static VALUE
 rb_hash_index(hash, value)
     VALUE hash, value;
diff --git a/parse.y b/parse.y
index 22bbabf0db..e537858b09 100644
--- a/parse.y
+++ b/parse.y
@@ -8218,6 +8218,7 @@ parser_new()
 #ifdef RIPPER_DEBUG
 extern int rb_is_pointer_to_heap _((VALUE));
 
+/* :nodoc: */
 static VALUE
 ripper_validate_object(self, x)
     VALUE self, x;
@@ -8696,6 +8697,7 @@ ripper_lineno(self)
 }
 
 #ifdef RIPPER_DEBUG
+/* :nodoc: */
 static VALUE
 ripper_assert_Qundef(self, obj, msg)
     VALUE self, obj, msg;
@@ -8707,6 +8709,7 @@ ripper_assert_Qundef(self, obj, msg)
     return Qnil;
 }
 
+/* :nodoc: */
 static VALUE
 ripper_value(self, obj)
     VALUE self, obj;
diff --git a/re.c b/re.c
index 8427535be4..daa179d819 100644
--- a/re.c
+++ b/re.c
@@ -1530,6 +1530,15 @@ rb_reg_match_pos(re, str, pos)
     return LONG2FIX(pos);
 }
 
+/*
+ *  call-seq:
+ *     rxp =~ str    => integer or nil
+ *  
+ *  Match---Matches <i>rxp</i> against <i>str</i>.
+ *
+ *     /at/ =~ "input data"   #=> 7
+ */
+
 VALUE
 rb_reg_match(re, str)
     VALUE re, str;