diff --git a/src/particle/particle/particle.py b/src/particle/particle/particle.py
index 6641fee3..e8ccd8fe 100644
--- a/src/particle/particle/particle.py
+++ b/src/particle/particle/particle.py
@@ -626,14 +626,14 @@ def __lt__(self, other: Particle | int) -> bool:
         return int(self.pdgid) < other
 
     def __eq__(self, other: object) -> bool:
-    """
-    Compare with another Particle instance based on PDG IDs.
+        """
+        Compare with another Particle instance based on PDG IDs.
 
-    Note
-    ----
-    Ensure the comparison also works for the special cases of the proton and the neutron,
-    which have two PDG ID representations as particles or nuclei.
-    """
+        Note
+        ----
+        Ensure the comparison also works for the special cases of the proton and the neutron,
+        which have two PDG ID representations as particles or nuclei.
+        """
         if isinstance(other, Particle):
             other = other.pdgid