diff --git a/yocto.md b/yocto.md
index 1f2bf7e..d2eaed3 100644
--- a/yocto.md
+++ b/yocto.md
@@ -1,5 +1,11 @@
 # Yocto
 
+### build cross-compilation toolchain
+```bitbake -c populate_sdk <core-image-recipe>```
+
+### recipe cleanup
+```bitbake -c clean <recipe>```
+
 ### devshell
 ```bitbake <recipe> -c devshell```