[skip ci] Add some comments

include/core/problem/problem.h

@@ -368,6 +368,7 @@ class Problem : public std::enable_shared_from_this<Problem>
         // All branches -------------------------------------------
         // perturb states
         void perturb(double amplitude = 0.01);
+        // transform states
         void transform(const VectorComposite& _transformation);
         bool isTransformed() const;
         void resetTransformed();
@@ -431,7 +432,7 @@ class Problem : public std::enable_shared_from_this<Problem>
         /**
          * \brief print wolf tree
          * \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 constr_by :    show factors pointing to F, C, f and L.
          * \param metric :       show metric info (status, time stamps, state vectors, measurements)
          * \param state_blocks : show state blocks
          */