diff --git a/src/meegsim/_check.py b/src/meegsim/_check.py
index 17c59cb..ddd6d04 100644
--- a/src/meegsim/_check.py
+++ b/src/meegsim/_check.py
@@ -352,7 +352,7 @@ def check_extents(extents, n_sources):
     for extent in extents:
         if extent is not None:
             # Check if each extent is a number
-            if not isinstance(extent, (int, float)):
+            if not isinstance(extent, (int, float, np.integer, np.floating)):
                 raise ValueError(f"Extent {extent} must be a number.")
 
             # Check if each extent is positive
diff --git a/src/meegsim/simulate.py b/src/meegsim/simulate.py
index 7b5a798..fd6a404 100644
--- a/src/meegsim/simulate.py
+++ b/src/meegsim/simulate.py
@@ -176,6 +176,10 @@ def add_patch_sources(
         self._source_groups.append(patch_sg)
         self._sources.extend(patch_sg.names)
 
+        # Check if SNR should be adjusted
+        if patch_sg.snr is not None:
+            self.is_snr_adjusted = True
+
         # Return the names of newly added sources
         return patch_sg.names