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diff --git a/HISTORY.md b/HISTORY.md
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--- a/HISTORY.md
+++ b/HISTORY.md
@@ -20,6 +20,7 @@ I tried to give credit whenever possible. If I have missed anyone, kindly add it
 - Fix: Make sure TARGET is set correctly when CURDIR contains spaces (https://github.com/svendahlstrand)
 - Fix: Ensure AVRDUDE_CONF is set when AVR_TOOLS_DIR is, not just on Windows (Issue #381) (https://github.com/sej7278)
 - Fix: Rename VENDOR to ARDMK_VENDOR to workaround tcsh issue (Issue #386) (https://github.com/sej7278)
+- Fix: Document OSX 1.0/1.6 ARDUINO_DIR differences (https://github.com/thomaskilian)
 
 ### 1.5 (2015-04-07)
 - New: Add support for new 1.5.x library layout (Issue #275) (https://github.com/lukasz-e)