diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index ea984007..5a2043f1 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -139,7 +139,7 @@ The migration file should include the sql statements needed to migrate the datab
 ### Protocol buffer ###
 
 Cockatrice and Servatrice exchange data using binary messages. The syntax of these messages is defined in the `proto` files in the `common/pb` folder. These files defines the way data contained in each message is serialized using Google's [protocol buffer](https://developers.google.com/protocol-buffers/).
-Any change to the `proto` file should be taken with caution and tested intensively before being merged, becaus a change to the protocol could make new clients incompatible to the old server and viceversa.
+Any change to the `proto` file should be taken with caution and tested intensively before being merged, becaus a change to the protocol could make new clients incompatible to the old server and vice versa.
 
 ### Translations: introduction ###