diff --git a/main.cpp b/main.cpp
index d639751..4a0dc62 100644
--- a/main.cpp
+++ b/main.cpp
@@ -18,7 +18,7 @@ Released under MIT license.
 Usage:
     -f --format    output file format. can be one of "cli, png, svg"
     -h --help      show this help
-	-i --input     take data from this argument instead of stdin
+    -i --input     take data from this argument instead of stdin
     -o --output    output file name
     -s --size      desired output file size in pixels
     -t --type      output QR code type. can be one of "small, medium, large"