diff --git a/src/CompletionProvider.php b/src/CompletionProvider.php
index 160798d..0c160aa 100644
--- a/src/CompletionProvider.php
+++ b/src/CompletionProvider.php
@@ -49,6 +49,7 @@ class CompletionProvider
         'eval',
         'exit',
         'extends',
+        'false',
         'final',
         'finally',
         'for',
@@ -67,6 +68,7 @@ class CompletionProvider
         'list',
         'namespace',
         'new',
+        'null',
         'or',
         'print',
         'private',
@@ -79,6 +81,7 @@ class CompletionProvider
         'switch',
         'throw',
         'trait',
+        'true',
         'try',
         'unset',
         'use',