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diff --git a/manual/string.texi b/manual/string.texi
index 943cb09b5c..45b2bc8472 100644
--- a/manual/string.texi
+++ b/manual/string.texi
@@ -372,6 +372,8 @@ terminated.
 
 This function is different to @code{strncpy} in that it always
 terminates the destination string.
+
+@code{strndup} is a GNU extension.
 @end deftypefun
 
 @comment string.h