diff --git a/build.py b/build.py
index db326bc42b..30f4c4232a 100755
--- a/build.py
+++ b/build.py
@@ -373,7 +373,7 @@ virtual('lint', 'build/lint-timestamp', 'build/lint-generated-timestamp',
 def build_lint_src_timestamp(t):
     t.run('%(GJSLINT)s',
           '--jslint_error=all',
-          '--custom_jsdoc_tags=todo',
+          '--custom_jsdoc_tags=todo,function',
           '--strict',
           t.newer(t.dependencies))
     t.touch()