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diff --git a/Porting/Glossary b/Porting/Glossary
index 32b29e2613..e56c6e1dcb 100644
--- a/Porting/Glossary
+++ b/Porting/Glossary
@@ -1701,6 +1701,8 @@ d_portable (d_portable.U):
d_prctl (d_prctl.U):
This variable conditionally defines the HAS_PRCTL symbol, which
indicates to the C program that the prctl() routine is available.
+ Note that there are at least two prctl variants: Linux and Irix.
+ While they are somewhat similar, they are incompatible.
d_prctl_set_name (d_prctl.U):
This variable conditionally defines the HAS_PRCTL_SET_NAME symbol,