diff --git a/include/compartment.h b/include/compartment.h
index a98ec6e..a9a3d17 100644
--- a/include/compartment.h
+++ b/include/compartment.h
@@ -169,9 +169,11 @@ struct CompConfig
     size_t entry_point_count;
     void *base_address;
 
-    char **env_ptr;
-    size_t env_ptr_sz;
-    unsigned short env_ptr_count;
+    // Variables related to `manager.h` prepared `environ` data
+    char **env_ptr; // pointer to `environ` array
+    size_t env_ptr_sz; // size of the array
+                       // TODO might be unneeded
+    unsigned short env_ptr_count; // number of entries
 };
 
 /**