Typo in Makefile

diff --git a/Makefile b/Makefile
index 8ee6687..5a25b0b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 #
 # Note: Due to MELPA distributing directly from github source version
-# needs to be embedded in files as is without proprocessing.
+# needs to be embedded in files as is without preprocessing.
