diff --git a/prody/proteins/interactions.py b/prody/proteins/interactions.py
index a35cf87ae..7c49cc4c0 100644
--- a/prody/proteins/interactions.py
+++ b/prody/proteins/interactions.py
@@ -186,7 +186,7 @@ def get_energy(pair, source):
         'GLUP': 'GLU',  # Protonated Glu
 
         # Lysine (Lys)
-        'LYN': 'LYS',   # Deprotonated lysine (nautral)
+        'LYN': 'LYS',   # Deprotonated lysine (neutral)
 
         # Arginine (Arg)
         'ARN': 'ARG',   # Deprotonated arginine (rare, GROMACS)