diff --git a/proc.c b/proc.c
index c07d33a387..4ec3e401bf 100644
--- a/proc.c
+++ b/proc.c
@@ -3312,7 +3312,7 @@ rb_method_compose_to_right(VALUE self, VALUE g)
  *
  *      test_return # => 4, return from proc
  *
- * Lambdas are useful as a self-sufficient higher-order functions, behaving
+ * Lambdas are useful as self-sufficient higher-order functions, behaving
  * exactly like Ruby methods. Procs are useful for implementing iterators:
  *
  *      def test
diff --git a/re.c b/re.c
index 4b05a4b4c3..a9ef3b6aad 100644
--- a/re.c
+++ b/re.c
@@ -925,7 +925,7 @@ make_regexp(const char *s, long len, rb_encoding *enc, int flags, onig_errmsg_bu
  *  * <code>$1</code>, <code>$2</code> and so on are
  *    <code>Regexp.last_match[i]</code> (captures by number);
  *  * <code>$`</code> is <code>Regexp.last_match.pre_match</code>;
- *  * <code>$`</code> is <code>Regexp.last_match.post_match</code>;
+ *  * <code>$'</code> is <code>Regexp.last_match.post_match</code>;
  *  * <code>$+</code> is <code>Regexp.last_match[-1]</code> (the last capture).
  *
  *  See also "Special global variables" section in Regexp documentation.