README: Add clarification

Be explicit and say that the program only takes input from STDIN.

1 files changed, 2 insertions, 0 deletions

diff --git a/README.md b/README.md
index b286373..2e263ec 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,8 @@ becomes
 
 Currently the implementation is very simplistic and liberal. Any `/>` will get replaced to remove the slash.
 
+Takes input from STDIN and outputs to STDOUT.
+
 
 ## License
 Licensed under the MIT license. See the included LICENSE file.