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-rw-r--r--doc/ref/posix.texi3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/ref/posix.texi b/doc/ref/posix.texi
index 950c3519d..e20309000 100644
--- a/doc/ref/posix.texi
+++ b/doc/ref/posix.texi
@@ -2189,7 +2189,8 @@ controlling terminal. The return value is unspecified.
The following procedures are similar to the @code{popen} and
@code{pclose} system routines. The code is in a separate ``popen''
-module:
+module@footnote{This module is only available on systems where the
+@code{fork} feature is provided (@pxref{Common Feature Symbols}).}:
@lisp
(use-modules (ice-9 popen))