diff --git a/src/Lexer.cpp b/src/Lexer.cpp
index 8cd6eb8..e3eb81c 100644
--- a/src/Lexer.cpp
+++ b/src/Lexer.cpp
@@ -27,6 +27,18 @@ namespace grino
 
     skip_spaces();
 
+    while (has_more(m_cursor)
+           && at(m_cursor) == ';')
+      {
+        while (has_more(m_cursor)
+           && at(m_cursor) != '\n')
+          {
+            m_cursor++;
+          }
+
+        skip_spaces();
+      }
+
     for (auto const& scanner: m_scanners)
       {
         auto my_info = scanner();
@@ -84,6 +96,7 @@ namespace grino
 
     char c = m_source[index];
     if (std::isspace(c)) { return true; }
+    if (c == ';') { return true; }
 
     auto itr = std::find(std::begin(m_separators),
                          std::end(m_separators),
diff --git a/src/Node.hpp b/src/Node.hpp
index 74a2b49..24a2f1a 100644
--- a/src/Node.hpp
+++ b/src/Node.hpp
@@ -6,7 +6,7 @@
 
 #define NODE_TYPE(G) \
   G(NODE_MODULE),    \
-    G(NODE_BOOL)
+    G(NODE_BOOL),
 
 namespace grino
 {
diff --git a/tests/Lexer.cpp b/tests/Lexer.cpp
index 4bdc426..b866e94 100644
--- a/tests/Lexer.cpp
+++ b/tests/Lexer.cpp
@@ -51,3 +51,14 @@ TEST_CASE_METHOD(LexerTest, "Lexer_booleans")
       test_end(lexer);
     }
 }
+
+TEST_CASE_METHOD(LexerTest, "Lexer_comments")
+{
+  grino::Lexer lexer {m_logger, "tests/lexer"};
+
+  lexer.scan(" true ; false \n\n true ");
+  test_next(lexer, "BOOL[true]");
+  test_next(lexer, "BOOL[true]");
+  test_end(lexer);
+
+}