diff --git a/src/main/kotlin/dsl/ast/parser/Parser.kt b/src/main/kotlin/dsl/ast/parser/Parser.kt
index 218dd0b..2715b45 100644
--- a/src/main/kotlin/dsl/ast/parser/Parser.kt
+++ b/src/main/kotlin/dsl/ast/parser/Parser.kt
@@ -8,6 +8,7 @@ import dsl.token.model.entity.Token
 import dsl.token.model.entity.TokenList
 import dsl.token.model.entity.TokenPosition
 import dsl.token.model.enumeration.TokenType
+import error.InvalidSyntaxException
 
 abstract class Parser {
     fun parse(input: TokenList): ParserOutput {
@@ -177,7 +178,7 @@ abstract class Parser {
                     val output = parser.parse(input)
 
                     if (output.result == ParsingResult.FAILED) {
-                        throw RuntimeException("Expected $expected")
+                        throw InvalidSyntaxException("Expected $expected, got '${input.current.rawValue}'", input.currentPos())
                     }
 
                     return output
diff --git a/src/main/kotlin/dsl/token/tokenizer/DefaultTokenizer.kt b/src/main/kotlin/dsl/token/tokenizer/DefaultTokenizer.kt
index 6ddeedf..af54959 100644
--- a/src/main/kotlin/dsl/token/tokenizer/DefaultTokenizer.kt
+++ b/src/main/kotlin/dsl/token/tokenizer/DefaultTokenizer.kt
@@ -2,6 +2,7 @@ package dsl.token.tokenizer
 
 import dsl.token.model.entity.Token
 import dsl.token.model.entity.TokenList
+import dsl.token.model.entity.TokenPosition
 import dsl.token.model.entity.TokenizerOutput
 import dsl.token.model.enumeration.TokenType
 import dsl.token.tokenizer.Tokenizer.Companion.default
@@ -9,6 +10,7 @@ import dsl.token.tokenizer.Tokenizer.Companion.keywords
 import dsl.token.tokenizer.Tokenizer.Companion.mapValue
 import dsl.token.tokenizer.Tokenizer.Companion.regex
 import dsl.token.tokenizer.Tokenizer.Companion.separated
+import error.InvalidSyntaxException
 
 class DefaultTokenizer : Tokenizer {
     private val tokenizers = listOf(
@@ -89,7 +91,7 @@ class DefaultTokenizer : Tokenizer {
                 val output = tokenize(line, current, index)
 
                 if (!output.consumed()) {
-                    throw RuntimeException("Unknown symbol ${line[current]}")
+                    throw InvalidSyntaxException("Unknown symbol ${line[current]}", TokenPosition(index, current, -1))
                 }
 
                 current += output.consumedChars
diff --git a/src/main/kotlin/error/InvalidSyntaxException.kt b/src/main/kotlin/error/InvalidSyntaxException.kt
new file mode 100644
index 0000000..f6cef2e
--- /dev/null
+++ b/src/main/kotlin/error/InvalidSyntaxException.kt
@@ -0,0 +1,8 @@
+package error
+
+import dsl.token.model.entity.TokenPosition
+
+class InvalidSyntaxException(message: String?, val position: TokenPosition?) : Exception(message) {
+    override val message: String?
+        get() = super.message + if(position != null) " $position" else ""
+}
\ No newline at end of file