diff --git a/src/common.rs b/src/common.rs
index 361d3d8..9d5cac6 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -170,6 +170,7 @@ pub enum AtRuleKind {
     /// Prints a message for debugging purposes
     Debug,
     If,
+    Else,
     Each,
     For,
     While,
@@ -231,6 +232,7 @@ impl TryFrom<&str> for AtRuleKind {
             "warn" => Ok(Self::Warn),
             "debug" => Ok(Self::Debug),
             "if" => Ok(Self::If),
+            "else" => Ok(Self::Else),
             "each" => Ok(Self::Each),
             "for" => Ok(Self::For),
             "while" => Ok(Self::While),
@@ -271,6 +273,7 @@ impl Display for AtRuleKind {
             Self::Warn => write!(f, "@warn"),
             Self::Debug => write!(f, "@debug"),
             Self::If => write!(f, "@if"),
+            Self::Else => write!(f, "@else"),
             Self::Each => write!(f, "@each"),
             Self::For => write!(f, "@for"),
             Self::While => write!(f, "@while"),
diff --git a/src/lib.rs b/src/lib.rs
index 2f0fee7..a007b7f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -487,6 +487,19 @@ fn eat_at_rule<I: Iterator<Item = Token>>(
             };
             Ok(Expr::MixinDecl(name, mixin))
         }
+        AtRuleKind::Use => todo!("@use not yet implemented"),
+        AtRuleKind::Annotation => todo!("@annotation not yet implemented"),
+        AtRuleKind::AtRoot => todo!("@at-root not yet implemented"),
+        AtRuleKind::Charset => todo!("@charset not yet implemented"),
+        AtRuleKind::Each => todo!("@each not yet implemented"),
+        AtRuleKind::Extend => todo!("@extend not yet implemented"),
+        AtRuleKind::If => todo!("@if not yet implemented"),
+        AtRuleKind::Else => todo!("@else not yet implemented"),
+        AtRuleKind::For => todo!("@for not yet implemented"),
+        AtRuleKind::While => todo!("@while not yet implemented"),
+        AtRuleKind::Media => todo!("@media not yet implemented"),
+        AtRuleKind::Function => todo!("@function not yet implemented"),
+        AtRuleKind::Keyframes => todo!("@keyframes not yet implemented"),
         _ => todo!("encountered unimplemented at rule"),
     }
 }