fix some example codes

1 files changed, 2 insertions, 2 deletions

diff --git a/manual.md b/manual.md
index 524ea1b6..c3bdb388 100644
--- a/manual.md
+++ b/manual.md
@@ -123,9 +123,9 @@ So, we can use this api to determine the current host operating system.
 
 ```lua
 if is_host("windows") then
-    add_includes("C:\\includes")
+    add_includedirs("C:\\includes")
 else
-    add_includes("/usr/includess")
+    add_includedirs("/usr/includess")
 end
 ```