diff --git a/include/core/problem/problem.h b/include/core/problem/problem.h
index 3affe6faaafe608ca68a076e752d78b8138f298c..8abc538d875763d1a8b50e82ef213420faaefc37 100644
--- a/include/core/problem/problem.h
+++ b/include/core/problem/problem.h
@@ -411,7 +411,7 @@ class Problem : public std::enable_shared_from_this<Problem>
         // Print and check ---------------------------------------
         /**
          * \brief print wolf tree
-         * \param depth :        levels to show ( 0: H, T, M : 1: H:S:p, T:F, M:L ; 2: T:F:C ; 3: T:F:C:f ; 4: T:F:C:f:c )
+         * \param depth :        levels to show ( 0: H, T, M : 1: H:S, T:F, M:L ; 2: H:S:p, T:F:C ; 3: T:F:C:f ; 4: T:F:C:f:c )
          * \param constr_by:     show factors pointing to F, f and L.
          * \param metric :       show metric info (status, time stamps, state vectors, measurements)
          * \param state_blocks : show state blocks