diff --git a/docs/encryption.md b/docs/encryption.md
index 9a99343..d83be17 100644
--- a/docs/encryption.md
+++ b/docs/encryption.md
@@ -32,5 +32,6 @@ ciphertext=$(echo -n $json | openssl enc -aes-128-cbc -K $key -iv $iv | base64)
 # The console will print "d3QhjQjP5majvNt5CjsvFWwqqj2gKl96RFj5OO+u6ynTt7lkyigDYNA3abnnCLpr"
 echo $ciphertext
 
+# URL encoding the ciphertext, there may be special characters.
 curl --data-urlencode "ciphertext=$ciphertext" http://api.day.app/$deviceKey
 ```
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