BlissRoms: Point users to Build Tips guide

Change-Id: I2a16424bf2122ced1275106d34c1cf0f5f90e6da
diff --git a/docs/BlissRoms/build-guide.md b/docs/BlissRoms/build-guide.md
index 94e3794..a7ac9b6 100644
--- a/docs/BlissRoms/build-guide.md
+++ b/docs/BlissRoms/build-guide.md
@@ -90,7 +90,7 @@
 
     repo sync -j$(nproc --all) -c
 
-
+*Note: For more information about the `repo` tool, visit the [Build Tips guide](build-tips.md) to learn more about the [repo flags](build-tips.md#repo-optimization-tips).*
 
 #### I still don't know how much CPU threads I have. How do I check?