diff --git a/[refs] b/[refs]
index 4894f05b4deb..46d47edd0d10 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 61d9cdf2a9ccb9e4770d7723db8b18b8952778ce
+refs/heads/master: 49490571bcfe24d279a66ba24198e8ba299fe58f
diff --git a/trunk/Documentation/kbuild/makefiles.txt b/trunk/Documentation/kbuild/makefiles.txt
index 2616a58a5a4b..9a1586590d82 100644
--- a/trunk/Documentation/kbuild/makefiles.txt
+++ b/trunk/Documentation/kbuild/makefiles.txt
@@ -872,7 +872,13 @@ When kbuild executes the following steps are followed (roughly):
 	Assignments to $(targets) are without $(obj)/ prefix.
 	if_changed may be used in conjunction with custom commands as
 	defined in 6.7 "Custom kbuild commands".
+
 	Note: It is a typical mistake to forget the FORCE prerequisite.
+	Another common pitfall is that whitespace is sometimes
+	significant; for instance, the below will fail (note the extra space
+	after the comma):
+		target: source(s) FORCE
+	#WRONG!#	$(call if_changed, ld/objcopy/gzip)
 
     ld
 	Link target. Often LDFLAGS_$@ is used to set specific options to ld.