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-rw-r--r--manual/memory.texi4
1 files changed, 4 insertions, 0 deletions
diff --git a/manual/memory.texi b/manual/memory.texi
index b565dd69f2..aa5011e4f9 100644
--- a/manual/memory.texi
+++ b/manual/memory.texi
@@ -3288,6 +3288,10 @@ in which memory protection keys are disabled.
 
 @item ENOSPC
 All available protection keys already have been allocated.
+
+The system does not implement memory protection keys or runs in a mode
+in which memory protection keys are disabled.
+
 @end table
 @end deftypefun