diff --git a/pygments/pygments_extk/__init__.py b/pygments/pygments_extk/__init__.py
index d6c54a4..48d62ef 100644
--- a/pygments/pygments_extk/__init__.py
+++ b/pygments/pygments_extk/__init__.py
@@ -17,7 +17,7 @@ class ExtKLexer(RegexLexer):
             (r'//.*?\n', Comment.Single),
         ],
         'keywords': [
-            (words(('kmod', 'endkm', 'including', 'subsort', 'eq', 'ceq', 'load', 'when'), suffix = r'\b'), Keyword),
+            (words(('kmod', 'endkm', 'including', 'subsort', 'eq', 'ceq', 'load', 'when', 'requires', 'module', 'endmodule', 'imports'), suffix = r'\b'), Keyword),
             (words(('syntax', 'sort', 'op', 'rule'), suffix = r'\b'), Keyword.Declaration),
             (words(('If', 'then', 'else', 'Let', 'Do', "Return"), suffix = r'\b'), Keyword),
         ],
@@ -25,8 +25,8 @@ class ExtKLexer(RegexLexer):
             (r'"(\\\\|\\"|[^"])*"', String),
         ],
         'identifiers': [
-            (r'[$@%.#]*[a-zA-Z_][a-zA-Z_0-9]*', Name.Variable),
-            (r'</?[$@%.#]*[a-zA-Z_][a-zA-Z_0-9]*>', Name.Tag),
+            (r'[$@%.#]*[a-zA-Z_][a-zA-Z_0-9-]*', Name.Variable),
+            (r'</?[$@%.#]*[a-zA-Z_][a-zA-Z_0-9-]*>', Name.Tag),
         ],
         'numbers': [
             (r'[+-]?[0-9]+', Number.Integer),