diff --git a/prody/dynamics/comd.py b/prody/dynamics/comd.py
index aabf641a3..278b4034e 100644
--- a/prody/dynamics/comd.py
+++ b/prody/dynamics/comd.py
@@ -668,7 +668,7 @@ def run(self, cutoff=15., n_modes=20, gamma=1., n_confs=50, rmsd=1.0,
         '''
 
         if self._isBuilt():
-            raise ValueError('ClustENM ensemble has been built; please start a new instance')
+            raise ValueError('CoMD ensemble has been built; please start a new instance')
 
         # set up parameters
         self._cutoff = cutoff
diff --git a/prody/dynamics/hybrid.py b/prody/dynamics/hybrid.py
index a949a92be..cc40e0e5e 100644
--- a/prody/dynamics/hybrid.py
+++ b/prody/dynamics/hybrid.py
@@ -894,7 +894,7 @@ def run(self, cutoff=15., n_modes=3, gamma=1., n_confs=50, rmsd=1.0,
         '''
 
         if self._isBuilt():
-            raise ValueError('ClustENM ensemble has been built; please start a new instance')
+            raise ValueError('ClustENM-like ensemble has been built; please start a new instance')
 
         # set up parameters
         self._cutoff = cutoff