diff --git a/src/main/resources/assets/org/orekit/rugged/RuggedMessages_en.utf8 b/src/main/resources/assets/org/orekit/rugged/RuggedMessages_en.utf8
index 6b1408b4192fc1a654f534e16a512740fe39dd4b..86cda9023125041784cebfbe1060cb5bb88eb1b6 100644
--- a/src/main/resources/assets/org/orekit/rugged/RuggedMessages_en.utf8
+++ b/src/main/resources/assets/org/orekit/rugged/RuggedMessages_en.utf8
@@ -86,7 +86,7 @@ NO_REFERENCE_MAPPINGS = no reference mappings for parameters estimation
 DUPLICATED_PARAMETER_NAME = a different parameter with name {0} already exists
 
 # rugged name is not found 
-INVALID_RUGGED_NAME = invalid Rugged name
+INVALID_RUGGED_NAME = invalid rugged name
 
 # refining context is only handled for limited number of configurations
 UNSUPPORTED_REFINING_CONTEXT = refining using {0} rugged instance is not handled