diff --git a/pyswarms/single/global_best.py b/pyswarms/single/global_best.py
index de7e2382..df28804f 100644
--- a/pyswarms/single/global_best.py
+++ b/pyswarms/single/global_best.py
@@ -20,7 +20,7 @@
 
 .. math::
 
-   v_{ij}(t + 1) = m * v_{ij}(t) + c_{1}r_{1j}(t)[y_{ij}(t) − x_{ij}(t)]
+   v_{ij}(t + 1) = w * v_{ij}(t) + c_{1}r_{1j}(t)[y_{ij}(t) − x_{ij}(t)]
                    + c_{2}r_{2j}(t)[\hat{y}_{j}(t) − x_{ij}(t)]
 
 Here, :math:`c1` and :math:`c2` are the cognitive and social parameters