diff --git a/resources/units/ground_units/Tetrarch.yaml b/resources/units/ground_units/Tetrarch.yaml
index 487e27cc..371c503c 100644
--- a/resources/units/ground_units/Tetrarch.yaml
+++ b/resources/units/ground_units/Tetrarch.yaml
@@ -2,7 +2,7 @@ class: Recon
 description: The Light Tank Mk VII (A17), also known as the Tetrarch, was a British
   light tank produced by Vickers-Armstrongs in the late 1930s and used during the
   Second World War. The Tetrarch was the latest in the line of light tanks built by
-  the company for the British Army. They where declered obsolete in 1946.
+  the company for the British Army. They were declared obsolete in 1946.
 introduced: 1938
 manufacturer: Vickers-Armstrongs
 origin: UK