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-rw-r--r--lib/system/orc.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/system/orc.nim b/lib/system/orc.nim
index 4c23aea6c..32c6b9adc 100644
--- a/lib/system/orc.nim
+++ b/lib/system/orc.nim
@@ -8,7 +8,7 @@
 #
 
 # Cycle collector based on
-# https://researcher.watson.ibm.com/researcher/files/us-bacon/Bacon01Concurrent.pdf
+# https://www.cs.purdue.edu/homes/hosking/690M/Bacon01Concurrent.pdf
 # And ideas from Lins' in 2008 by the notion of "critical links", see
 # "Cyclic reference counting" by Rafael Dueire Lins
 # R.D. Lins / Information Processing Letters 109 (2008) 71–78