diff --git a/core/includes/unicode.inc b/core/includes/unicode.inc
index c08541e..981a810 100644
--- a/core/includes/unicode.inc
+++ b/core/includes/unicode.inc
@@ -377,13 +377,15 @@ function mime_header_decode($header) {
 }
 
 /**
- * Helper function for mime_header_decode().
+ * Decodes non-encoded header data passed from mime_header_decode().
  *
  * @param $matches
  *   The array of matches from preg_replace_callback().
  *
  * @return string
  *   The mime-decoded header.
+ *
+ * @see mime_header_decode()
  */
 function _mime_header_decode($matches) {
   // Regexp groups:
@@ -489,15 +491,15 @@ function drupal_strtolower($text) {
 }
 
 /**
- * Helps the function for case conversion of Latin-1.
- *
- * Used for flipping U+C0-U+DE to U+E0-U+FD and back.
+ * Flips U+C0-U+DE to U+E0-U+FD and back.
  *
  * @param $matches
  *   An array of matches.
  *
  * @return array
  *   Flips character to Latin-1 version.
+ *
+ * @see drupal_strtolower()
  */
 function _unicode_caseflip($matches) {
   return $matches[0][0] . chr(ord($matches[0][1]) ^ 32);
diff --git a/core/includes/update.inc b/core/includes/update.inc
index fa9db33..7e5fd19 100644
--- a/core/includes/update.inc
+++ b/core/includes/update.inc
@@ -47,7 +47,7 @@ function update_fix_compatibility() {
 }
 
 /**
- * Helps the function that test the compatibility of a module or theme.
+ * Tests the compatibility of a module or theme.
  */
 function update_check_incompatibility($name, $type = 'module') {
   static $themes, $modules;