diff --git a/Arduino.mk b/Arduino.mk
index 561793d..eb94a3c 100644
--- a/Arduino.mk
+++ b/Arduino.mk
@@ -45,11 +45,16 @@
 # that things are canonically arranged beneath the directories defined
 # above.
 #
-# On the Mac you might want to set:
+# On the Mac with IDE 1.0 you might want to set:
 #
 #   ARDUINO_DIR   = /Applications/Arduino.app/Contents/Resources/Java
 #   ARDMK_DIR     = /usr/local
 #
+# On the Mac with IDE 1.5+ you might want to set:
+#
+#   ARDUINO_DIR   = /Applications/Arduino.app/Contents/Java
+#   ARDMK_DIR     = /usr/local
+#
 # On Linux, you might prefer:
 #
 #   ARDUINO_DIR   = /usr/share/arduino
diff --git a/README.md b/README.md
index 120d1da..19b0f0e 100644
--- a/README.md
+++ b/README.md
@@ -134,7 +134,7 @@ whilst [Blink](examples/Blink/Makefile) demonstrates the minimal settings requir
 
 Download a copy of this repo some where in your system or install it through a package.
 
-On the Mac you might want to set:
+On the Mac with IDE 1.0 you might want to set:
 
 ```make
     ARDUINO_DIR   = /Applications/Arduino.app/Contents/Resources/Java
@@ -144,6 +144,11 @@ On the Mac you might want to set:
     BOARD_TAG     = mega2560
 ```
 
+On the Mac with IDE 1.5+ it's like above but with
+
+    ARDUINO_DIR   = /Applications/Arduino.app/Contents/Java
+```
+
 On Linux (if you have installed through package), you shouldn't need to set anything other than your board type and port:
 
 ```make