diff --git a/km3io/tools.py b/km3io/tools.py
index 6a683dbdfa73e85a0b2b2b264404f4404bdba0fa..d5498914f53a7cee906d668825920d1c32248d84 100644
--- a/km3io/tools.py
+++ b/km3io/tools.py
@@ -118,7 +118,7 @@ def w2list_gseagen_keys():
 
 
 def get_w2list_param(events, generator, param):
-    """get all the values of a specific parameter from the w2list
+    """Get all the values of a specific parameter from the w2list
     in offline neutrino files.
 
     Parameters