diff --git a/Diagram.hs b/Diagram.hs
index 486a641..10e157e 100644
--- a/Diagram.hs
+++ b/Diagram.hs
@@ -16,7 +16,7 @@ import Meshparser
 import Util
 
 
--- |Represents a Cairo Diagram. This allow us to create multiple
+-- |Represents a Cairo Diagram. This allows us to create multiple
 -- diagrams with different algorithms but based on the same
 -- coordinates and common properties.
 data Diag = Diag {