diff --git a/src/wp-admin/includes/class-plugin-upgrader.php b/src/wp-admin/includes/class-plugin-upgrader.php
index 67d04ccc75..5d50ce61f4 100644
--- a/src/wp-admin/includes/class-plugin-upgrader.php
+++ b/src/wp-admin/includes/class-plugin-upgrader.php
@@ -238,7 +238,7 @@ class Plugin_Upgrader extends WP_Upgrader {
 			)
 		);
 
-		// Cleanup our hooks, in case something else does a upgrade on this connection.
+		// Cleanup our hooks, in case something else does an upgrade on this connection.
 		remove_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9 );
 		remove_filter( 'upgrader_pre_install', array( $this, 'deactivate_plugin_before_upgrade' ) );
 		remove_filter( 'upgrader_pre_install', array( $this, 'active_before' ) );
@@ -386,7 +386,7 @@ class Plugin_Upgrader extends WP_Upgrader {
 
 		$this->skin->footer();
 
-		// Cleanup our hooks, in case something else does a upgrade on this connection.
+		// Cleanup our hooks, in case something else does an upgrade on this connection.
 		remove_filter( 'upgrader_clear_destination', array( $this, 'delete_old_plugin' ) );
 
 		// Ensure any future auto-update failures trigger a failure email by removing
diff --git a/src/wp-admin/includes/class-theme-upgrader.php b/src/wp-admin/includes/class-theme-upgrader.php
index 418888b262..02a150483f 100644
--- a/src/wp-admin/includes/class-theme-upgrader.php
+++ b/src/wp-admin/includes/class-theme-upgrader.php
@@ -487,7 +487,7 @@ class Theme_Upgrader extends WP_Upgrader {
 
 		$this->skin->footer();
 
-		// Cleanup our hooks, in case something else does a upgrade on this connection.
+		// Cleanup our hooks, in case something else does an upgrade on this connection.
 		remove_filter( 'upgrader_pre_install', array( $this, 'current_before' ) );
 		remove_filter( 'upgrader_post_install', array( $this, 'current_after' ) );
 		remove_filter( 'upgrader_clear_destination', array( $this, 'delete_old_theme' ) );
diff --git a/src/wp-admin/includes/class-wp-filesystem-base.php b/src/wp-admin/includes/class-wp-filesystem-base.php
index fbe8b3cc60..a7e49f2fbd 100644
--- a/src/wp-admin/includes/class-wp-filesystem-base.php
+++ b/src/wp-admin/includes/class-wp-filesystem-base.php
@@ -398,7 +398,7 @@ class WP_Filesystem_Base {
 	}
 
 	/**
-	 * Converts *nix-style file permissions to a octal number.
+	 * Converts *nix-style file permissions to an octal number.
 	 *
 	 * Converts '-rw-r--r--' to 0644
 	 * From "info at rvgate dot nl"'s comment on the PHP documentation for chmod()
diff --git a/src/wp-admin/includes/update-core.php b/src/wp-admin/includes/update-core.php
index 14a0362c84..3c3510c6d6 100644
--- a/src/wp-admin/includes/update-core.php
+++ b/src/wp-admin/includes/update-core.php
@@ -1496,7 +1496,10 @@ function update_core( $from, $to ) {
 					$wp_filesystem->mkdir( $dest . $filename, FS_CHMOD_DIR );
 					$_result = copy_dir( $from . $distro . 'wp-content/' . $file, $dest . $filename );
 
-					// If a error occurs partway through this final step, keep the error flowing through, but keep process going.
+					/*
+					 * If an error occurs partway through this final step,
+					 * keep the error flowing through, but keep the process going.
+					 */
 					if ( is_wp_error( $_result ) ) {
 						if ( ! is_wp_error( $result ) ) {
 							$result = new WP_Error();
diff --git a/src/wp-admin/update-core.php b/src/wp-admin/update-core.php
index 53d3d73b60..138dfec756 100644
--- a/src/wp-admin/update-core.php
+++ b/src/wp-admin/update-core.php
@@ -1019,7 +1019,7 @@ get_current_screen()->set_help_sidebar(
 );
 
 if ( 'upgrade-core' === $action ) {
-	// Force a update check when requested.
+	// Force an update check when requested.
 	$force_check = ! empty( $_GET['force-check'] );
 	wp_version_check( array(), $force_check );