diff --git a/add.md b/add.md
index be00d44..e63b7e3 100644
--- a/add.md
+++ b/add.md
@@ -25,6 +25,7 @@ OPTIONS:
    -bit-identical                       (when using -copy) make the new storage bit-identical to also allow rsync etc.
    -repository <path>                   specify the path of the repository (instead of the current working directory)
    -key <public key>                    the RSA public key to encrypt file chunks
+   -erasure-coding <data shards>:<parity shards>        enable erasure coding to protect against storage corruption
 ```
 
 
@@ -101,6 +102,10 @@ This means of course, that the added storage can have a different password from
 
 The `-key` option enables [[RSA encryption]].
 
+### `-erasure-coding <data shards>:<parity shards>`
+
+The `-erasure-coding` option enables [[Erasure coding]].
+
 # Notes
 
 :bulb: Each storage name must be _unique_ in order to distinguish it from other storage.