diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index fe0b29bf2df7..6fd0d3aa492c 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -452,6 +452,9 @@ extern int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
 				unsigned int flags);
 extern void unlock_page(struct page *page);
 
+/*
+ * Return true if the page was successfully locked
+ */
 static inline int trylock_page(struct page *page)
 {
 	page = compound_head(page);