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-rw-r--r--nix.conf.example11
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diff --git a/nix.conf.example b/nix.conf.example
index e17cf3c25f60..7063bed54c4d 100644
--- a/nix.conf.example
+++ b/nix.conf.example
@@ -59,6 +59,17 @@
 #build-max-jobs = 1
 
 
+### Option `build-cores'
+#
+# This option defines the number of CPU cores to utilize in parallel
+# within a build job, i.e. by passing an appropriate `-jN' flag to GNU
+# make. The default is 1, meaning that parallel building within jobs
+# is disabled.  Passing the special value `0' causes Nix to try and
+# auto-detect the number of available cores on the local host.  This
+# setting can be overridden using the `--cores' command line switch.
+#build-cores = 1
+
+
 ### Option `build-max-silent-time'
 #
 # This option defines the maximum number of seconds that a builder can