diff --git a/src/cthulhu/cthulhu.py b/src/cthulhu/cthulhu.py
index 76bba92..98f29b6 100644
--- a/src/cthulhu/cthulhu.py
+++ b/src/cthulhu/cthulhu.py
@@ -81,7 +81,17 @@ class APIHelper:
             logger.info(f"Final key: {final_key}")
 
             # Check for additional modifiers and combine them properly
-            if "shift" in key_parts:
+            if "control" in key_parts and "shift" in key_parts:
+                # Combine Cthulhu + Control + Shift modifiers
+                modifiers = (keybindings.CTHULHU_MODIFIER_MASK | 
+                           keybindings.CTRL_MODIFIER_MASK | 
+                           keybindings.SHIFT_MODIFIER_MASK)
+                logger.info(f"Using CTHULHU+CTRL+SHIFT combined mask: {modifiers}")
+            elif "control" in key_parts:
+                # Use the pre-defined Cthulhu+Control mask
+                modifiers = keybindings.CTHULHU_CTRL_MODIFIER_MASK
+                logger.info(f"Using CTHULHU_CTRL_MODIFIER_MASK: {modifiers}")
+            elif "shift" in key_parts:
                 # Use the pre-defined combined mask rather than trying to OR them
                 modifiers = keybindings.CTHULHU_SHIFT_MODIFIER_MASK
                 logger.info(f"Using CTHULHU_SHIFT_MODIFIER_MASK: {modifiers}")