diff --git a/soitool/database.py b/soitool/database.py
index 12e6539850e172da47c8ba1a8d2c037bca1917c1..db4854ca28b72c705ed088d65f548f840b268fb0 100644
--- a/soitool/database.py
+++ b/soitool/database.py
@@ -226,7 +226,7 @@ class Database:
 
     def update_codebook_auto(self):
         """
-        Updates Codebook if it is less than 10 til next update.
+        Update Codebook if it is less than 10 til next update.
 
         Returns
         -------