diff --git a/man3/printf.3 b/man3/printf.3
index edb92f09a..c20cd5343 100644
--- a/man3/printf.3
+++ b/man3/printf.3
@@ -890,6 +890,13 @@ POSIX.1-2001, POSIX.1-2008, C89, C99.
 .BR snprintf (),
 .BR vsnprintf ():
 POSIX.1-2001, POSIX.1-2008, C99.
+
+The
+.BR dprintf ()
+and
+.BR vdprintf ()
+functions were originally GNU extensions that were later standardized
+in POSIX.1-2008.
 .PP
 Concerning the return value of
 .BR snprintf (),