Reword error message.

1 files changed, 1 insertions, 1 deletions

diff --git a/omptagger b/omptagger
index 2ae0133..d2f191f 100755
--- a/omptagger
+++ b/omptagger
@@ -462,7 +462,7 @@ GetoptLong.new(
   when :viewtag, :removetag
     actions << Action.new(option, argument.dup)
   when :addtag, :settag
-    raise 'Incorrect argument' unless argument.include?('=')
+    raise 'Insufficient argument.' unless argument.include?('=')
     actions << Action.new(option, *argument.split('=', 2))
   when :generate, :rename
     actions << Action.new(option, scheme)