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diff --git a/README b/README
index 2e9dca5..9beb21f 100644
--- a/README
+++ b/README
@@ -3,7 +3,7 @@ NAME
 
 DESCRIPTION
 	libred is a C library for calculating the Sun's apparent
-	elevation and colours temperatures.
+	elevation and colour temperatures.
 
 SEE ALSO
 	solar-python(7), radharc(1), redshift(1), blueshift(1),