diff --git a/lab-4/parser.bison b/lab-4/parser.bison
index e4c4b6f..ea371e0 100644
--- a/lab-4/parser.bison
+++ b/lab-4/parser.bison
@@ -28,6 +28,8 @@ int yylex();
 %token TOKEN_UNTIL
 %token TOKEN_END_PERFORM
 %token TOKEN_IF
+%token TOKEN_ELSE
+%token TOKEN_ELSE_IF
 %token TOKEN_END_IF
 %token TOKEN_SPACE
 %token TOKEN_KEYWORD_OCCURS
diff --git a/lab-4/scanner.flex b/lab-4/scanner.flex
index 4a3e7e4..b6843eb 100644
--- a/lab-4/scanner.flex
+++ b/lab-4/scanner.flex
@@ -27,6 +27,8 @@ PERFORM { return TOKEN_PERFORM; }
 END-PERFORM { return TOKEN_END_PERFORM; }
 IF { return TOKEN_IF; }
 END-IF { return TOKEN_END_IF; }
+ELSE { return TOKEN_ELSE; }
+ELSE-IF { return TOKEN_ELSE_IF; }
 SPACE { return TOKEN_SPACE; }
 PIC { return TOKEN_PICTURE; }
 OCCURS { return TOKEN_KEYWORD_OCCURS; }