+.Sh COMPATIBILITY
+.Fn fputs
+now returns a non-negative number (as opposed to 0)
+on successful completion.
+As a result, many tests (e.g., "fputs() == 0", "fputs() != 0")
+do not give the desired result.
+Use "fputs() != EOF" or "fputs() == EOF"
+to determine success or failure.