diff --git a/src/66/66-intree.c b/src/66/66-intree.c
index a8761079f3c58276426b0155fb18c4d05faa8cf1..0d9e17d6814fc950a1d7ccba8d7efbc8e54244b1 100644
--- a/src/66/66-intree.c
+++ b/src/66/66-intree.c
@@ -99,7 +99,7 @@ static inline void info_help (void)
 "   -d: limit the depth of the contents field recursion\n"
 "   -r: reverse the contents field\n"
 "\n"
-"valid field for -o options are:\n"
+"valid fields for -o options are:\n"
 "\n"
 "   name: displays the name of the tree\n"
 "   init: displays a boolean value of the initialization state\n"