diff --git a/Makefile b/Makefile
index e83fc0b..54f04b9 100644
--- a/Makefile
+++ b/Makefile
@@ -42,6 +42,7 @@
 endif
 ifeq ($(OS_ARCH), Darwin)
 CPPFLAGS += -I/opt/local/include -I/usr/local/include
+# DirectIO framework can be found in the DirectHW library.
 LDFLAGS += -framework IOKit -framework DirectIO -L/opt/local/lib -L/usr/local/lib
 endif
 ifeq ($(OS_ARCH), FreeBSD)
diff --git a/README b/README
index a714d09..5b1799b 100644
--- a/README
+++ b/README
@@ -87,8 +87,8 @@
 
 To compile and run on Darwin/Mac OS X:
 
- Install DirectIO from coresystems GmbH.
- DirectIO is available at http://www.coresystems.de/en/directio.
+ Install DirectHW from coresystems GmbH.
+ DirectHW is available at http://www.coresystems.de/en/directhw .
 
 To cross-compile on Linux for DOS:
 
diff --git a/cbtable.c b/cbtable.c
index 2b02e71..dbb2cff 100644
--- a/cbtable.c
+++ b/cbtable.c
@@ -203,7 +203,7 @@
 	struct lb_record *rec, *last;
 
 #ifdef __DARWIN__
-	/* This is a hack. DirectIO fails to map physical address 0x00000000.
+	/* This is a hack. DirectHW fails to map physical address 0x00000000.
 	 * Why?
 	 */
 	start = 0x400;
diff --git a/hwaccess.h b/hwaccess.h
index 9bf37f2..63a2bf2 100644
--- a/hwaccess.h
+++ b/hwaccess.h
@@ -193,6 +193,7 @@
   #define INL(x) __extension__ ({ u_int inl_tmp = (x); inl(inl_tmp); })
 #else
 #if defined(__DARWIN__)
+    /* Header is part of the DirectHW library. */
     #include <DirectIO/darwinio.h>
     #define off64_t off_t
     #define lseek64 lseek