diff --git a/README.md b/README.md
index 08b4182..fa84c84 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,12 @@
 
 Increment your version using this command line tool.
 
-It depends only `zsh` so should be really portable.
+It follows the SemVer conventions. See <http://semver.org>.
+
+It depends only `zsh` so should be really portable
+but also quite slow if you need to bump thousands versions per seconds.
+
+In the future I might create a fast binary executable.
 
 ## Install
 
@@ -21,3 +26,5 @@ $ bump.sh 0.14.2 patch
 $ bump.sh 0.14.2 qualifier rc1
 0.14.2-rc1
 ~~~
+
+That's it!
diff --git a/bump.sh b/bump.sh
index 9e2e513..957c1c4 100755
--- a/bump.sh
+++ b/bump.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env zsh
 
-# change release version in all subprojects
-
+# Author: Yann Esposito
+# License: MIT
 
 ## 1. get current version