diff --git a/sko/GA.py b/sko/GA.py
index b3c3904..1e91e59 100644
--- a/sko/GA.py
+++ b/sko/GA.py
@@ -148,6 +148,9 @@ def __init__(self, func, n_dim,
         Lind_raw = np.log2((self.ub - self.lb) / self.precision + 1)
         self.Lind = np.ceil(Lind_raw).astype(int)
 
+        # if precision is integer:
+        # if Lind_raw is integer, which means the number of all possible value is 2**n, no need to modify
+        # if Lind_raw is decimal, modify: make the ub bigger and add a constraint_ueq
         int_mode = (self.precision % 1 == 0) & (Lind_raw % 1 != 0)
         # int_mode is an array of True/False. If True, variable is int constraint and need more code to deal with
         for i in range(self.n_dim):
@@ -155,6 +158,7 @@ def __init__(self, func, n_dim,
                 self.constraint_ueq.append(
                     lambda x: x[i] - self.ub[i]
                 )
+                self.has_constraint = True
                 self.ub[i] = self.lb[i] + np.exp2(self.Lind[i]) - 1
 
         self.len_chrom = sum(self.Lind)