diff --git a/container.php b/container.php
index 3ba3fbaf82..589bb37dae 100644
--- a/container.php
+++ b/container.php
@@ -751,7 +751,7 @@
 };
 
 // Queue of callbacks to run by DeferredUpdates, but only
-// on successfull commit
+// on successful commit
 $c['deferred_queue'] = function ( $c ) {
 	return new SplQueue;
 };
diff --git a/includes/Formatter/BaseTopicListFormatter.php b/includes/Formatter/BaseTopicListFormatter.php
index 23ba7927a2..d408839b0d 100644
--- a/includes/Formatter/BaseTopicListFormatter.php
+++ b/includes/Formatter/BaseTopicListFormatter.php
@@ -10,7 +10,7 @@ class BaseTopicListFormatter {
 	 * Builds the results for an empty topic.
 	 *
 	 * @param Workflow $workflow Workflow for topic list
-	 * @return array Associative array with the the result
+	 * @return array Associative array with the result
 	 */
 	public function buildEmptyResult( Workflow $workflow ) {
 		return [
diff --git a/includes/Import/Postprocessor/Postprocessor.php b/includes/Import/Postprocessor/Postprocessor.php
index 745eacfbac..717dd0228b 100644
--- a/includes/Import/Postprocessor/Postprocessor.php
+++ b/includes/Import/Postprocessor/Postprocessor.php
@@ -13,7 +13,7 @@
 // implement what you want, without 'not a thing to do yet'
 interface Postprocessor {
 	/**
-	 * Called after the successfull commit of a header. This is
+	 * Called after the successful commit of a header. This is
 	 * currently called regardless of if any new content was imported.
 	 *
 	 * @param PageImportState $state
diff --git a/includes/TemplateHelper.php b/includes/TemplateHelper.php
index c0e2d4a2c6..bea56ead00 100644
--- a/includes/TemplateHelper.php
+++ b/includes/TemplateHelper.php
@@ -40,7 +40,7 @@ public function __construct( $templateDir, $forceRecompile = false ) {
 	}
 
 	/**
-	 * Constructs the location of the the source handlebars template
+	 * Constructs the location of the source handlebars template
 	 * and the compiled php code that goes with it.
 	 *
 	 * @param string $templateName