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-rw-r--r--doc/posix-functions/tolower.texi2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/posix-functions/tolower.texi b/doc/posix-functions/tolower.texi
index c985f9659f..719a2cc5d0 100644
--- a/doc/posix-functions/tolower.texi
+++ b/doc/posix-functions/tolower.texi
@@ -4,7 +4,7 @@
POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/tolower.html}
-Gnulib module: ---
+Gnulib module: ctype
Portability problems fixed by Gnulib:
@itemize