diff --git a/interpreter.cpp b/interpreter.cpp
index 3a3d2e6..1b1b71f 100644
--- a/interpreter.cpp
+++ b/interpreter.cpp
@@ -46,7 +46,13 @@ std::string interpreter::eval(std::istream& in, bool& done) {
     while (_pc < _prog.size() && !done) {
         // fetch next instruction
         std::string code {_prog[_pc]};
-        
+
+        // check comment
+        if (code[0] == '#') {
+            _pc++;
+            continue;
+        }
+
         // check literal int
         if (std::isdigit(code[0])) {
             _stack.push_back(code);