1 files changed, 10 insertions, 0 deletions

diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index d4b05672f9f7..d76cfd8712e1 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -316,6 +316,16 @@ more details, with real examples.
                 #arch/m68k/fpsp040/Makefile
                 ldflags-y := -x
 
+    subdir-ccflags-y, subdir-asflags-y
+        The two flags listed above are similar to ccflags-y and as-falgs-y.
+        The difference is that the subdir- variants has effect for the kbuild
+        file where tey are present and all subdirectories.
+        Options specified using subdir-* are added to the commandline before
+        the options specified using the non-subdir variants.
+
+        Example:
+                subdir-ccflags-y := -Werror
+
     CFLAGS_$@, AFLAGS_$@
 
         CFLAGS_$@ and AFLAGS_$@ only apply to commands in current