diff --git a/cmdarg.sh b/cmdarg.sh
index b1e0f3d..282b05c 100644
--- a/cmdarg.sh
+++ b/cmdarg.sh
@@ -102,7 +102,7 @@ function cmdarg_info
     # Sets various flags about your script that are printed during cmdarg_usage
     #
     local flags="header|copyright|footer|author"
-    if [[ "$1" =~ $flags ]]; then
+    if [[ ! "$1" =~ $flags ]]; then
 	echo "cmdarg_info <flag> <value>" >&2
 	echo "Where <flag> is one of $flags" >&2
 	${CMDARG_ERROR_BEHAVIOR} 1