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-rw-r--r--INSTALL.md3
1 files changed, 2 insertions, 1 deletions
diff --git a/INSTALL.md b/INSTALL.md
index 2567b791e5..1061c5187a 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -277,7 +277,8 @@ Some of the available `configure` options are:
x86 processors before pentium 4 (back to 486) in the ethread library. If
not passed the ethread library (part of the runtime system) will use
instructions that first appeared on the pentium 4 processor when building
- for x86.
+ for x86. This option will be automatically enabled if required on the
+ build machine.
* `--with-libatomic_ops=PATH` - Use the `libatomic_ops` library for atomic
memory accesses. If `configure` should inform you about no native atomic
implementation available, you typically want to try using the