Add note to help people understand this documentation

may not refer to the (shell built-in) command they're running.

diff --git a/man/printf.x b/man/printf.x
index 6489ec5..2e0ded3 100644 (file)
--- a/man/printf.x
+++ b/man/printf.x
@@ -1,4 +1,7 @@
 [NAME]
 printf \- format and print data
 [DESCRIPTION]
-.\" Add any additional description here
+NOTE: your shell may have its own version of printf which will supercede
+the version described here. Please refer to your shell's documentation
+for details about the options it supports.
+