Typo fixes in documentation

diff --git a/Makefile b/Makefile
index 6a3b818..2db2644 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 
-# build crypto form submodule unless explicitly disabled
+# build crypto from submodule unless explicitly disabled
 USE_CRYPTO_SUBMODULE ?= 1
 
 DESTDIR=/usr/local