diff --git a/README.md b/README.md
index 2ea702b..b5a4d69 100644
--- a/README.md
+++ b/README.md
@@ -69,7 +69,7 @@ optional parameters, can appear in any order
 \<silent\> suppress success message
 
 ## git-retag.sh
-Remove existing tags and create a new tag based on %version-%release in spec file (without trailing el7.sme)
+Create a new tag based on %version-%release in spec file (without trailing el7.sme) and optionally remove old tags
 
     git-retag.sh <repository> <organisation> [<local> <debug> <noisy>]
 
@@ -78,6 +78,7 @@ Remove existing tags and create a new tag based on %version-%release in spec fil
 
 optional parameters, can appear in any order
 
+* \<purge\> will remove all existing tags
 * \<local\> will use parameters set for local repository, else it will use remote
 * \<debug\> run with debug output
 * \<noisy\> will will print a line showing how it was called