diff --git a/README.md b/README.md
index 85c795e..d61943c 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,10 @@ Execute the IPEL code by navigating to the repository folder and running `interp
 ```
 $ python3 interpreter.py [options] (codeFile | code)
 ```
+or
+```
+$ ./interpreter.py [options] (codeFile | code)
+```
 
 `codeFile` is any file that contains IPEL code.
 `code` is a string that contains IPEL code.
diff --git a/src/evaluator.py b/src/evaluator.py
index d7f57f9..eb243e6 100644
--- a/src/evaluator.py
+++ b/src/evaluator.py
@@ -66,13 +66,15 @@ def evaluate(lex, lab, debugmode, unvoiced, voiced, executionStack, currentStack
                 elif type(con) in [list]:
                     truthy = con != []
                 ep += 1 if truthy else 0
-            # loop index getters and setters
-            elif lex[ep].lexeme == "e":
-                if numLoops > 0:
+            # loop index and limit getters and setters
+            elif lex[ep].lexeme == "e" and len(executionStack) > 0:
                     currentStack.append(executionStack[-1])
-            elif lex[ep].lexeme == "ø":
-                if numLoops > 0:
+            elif lex[ep].lexeme == "ø" and len(executionStack) > 0:
                     executionStack[-1] = currentStack.pop()
+            elif lex[ep].lexeme == "æ" and len(executionStack) > 1:
+                    currentStack.append(executionStack[-2])
+            elif lex[ep].lexeme == "œ" and len(executionStack) > 1:
+                    executionStack[-2] = currentStack.pop()
             # voicing
             elif lex[ep].lexeme == "ɸ":
                 currentStack = unvoiced
diff --git a/src/util.py b/src/util.py
index 7acbbe0..c63d39d 100644
--- a/src/util.py
+++ b/src/util.py
@@ -92,4 +92,4 @@ def convert_base(s, base=10):
         integer = digits[i[1]]
         if integer >= base: raise ValueError
         ret += base**-(i[0] + 1) * integer
-    return ret
+    return ret
\ No newline at end of file