diff --git a/wp-includes/theme.php b/wp-includes/theme.php
index 36f01b3f36..522aa0560c 100644
--- a/wp-includes/theme.php
+++ b/wp-includes/theme.php
@@ -340,7 +340,7 @@ function search_theme_directories( $force = false ) {
 
 	// Set up maybe-relative, maybe-absolute array of theme directories.
 	// We always want to return absolute, but we need to cache relative
-	// use in for get_theme_root().
+	// to use in get_theme_root().
 	foreach ( $wp_theme_directories as $theme_root ) {
 		if ( 0 === strpos( $theme_root, WP_CONTENT_DIR ) )
 			$relative_theme_roots[ str_replace( WP_CONTENT_DIR, '', $theme_root ) ] = $theme_root;
@@ -544,7 +544,7 @@ function locale_stylesheet() {
 /**
  * Start preview theme output buffer.
  *
- * Will only preform task if the user has permissions and template and preview
+ * Will only perform task if the user has permissions and template and preview
  * query variables exist.
  *
  * @since 2.6.0