diff --git a/andes/models/governor/tgov1.py b/andes/models/governor/tgov1.py
index 879b4e57f..9c65c7d74 100644
--- a/andes/models/governor/tgov1.py
+++ b/andes/models/governor/tgov1.py
@@ -138,7 +138,7 @@ def __init__(self, system, config):
         self.pref.v_str = 'tm0'
         self.pref.e_str = 'pref0 - pref'
 
-        self.pd.e_str = 'ue*(DB_y * gain + pref + paux) - pd'
+        self.pd.e_str = 'ue*(-DB_y * gain + pref + paux) - pd'
 
 
 class TGOV1ModelAlt(TGBase):
diff --git a/docs/source/release-notes.rst b/docs/source/release-notes.rst
index e06172dc7..3f4a1e22d 100644
--- a/docs/source/release-notes.rst
+++ b/docs/source/release-notes.rst
@@ -45,7 +45,7 @@ Other changes:
 - Add method ``GroupBase.get_all_idxes()`` to get all indices of a group.
 - Enhanced three-winding transformer parsing in PSS/E raw files by assigning the equivalent star bus ``area``,
   ``owner``, and ``zone`` using the high-voltage bus values.
-- Specify `multiprocess<=0.70.16` in requirements as 0.70.17 does not support Linux.
+- Minor fix on model ``TGOV1NDB``
 
 v1.9.2 (2024-03-25)
 -------------------
diff --git a/requirements.txt b/requirements.txt
index e2474fd24..b7f2ef4c5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,4 +15,3 @@ chardet
 psutil
 texttable
 numba
-multiprocess <=0.70.16