diff --git a/Logging/SLLogger.h b/Logging/SLLogger.h
index 7d59863..a2d0626 100644
--- a/Logging/SLLogger.h
+++ b/Logging/SLLogger.h
@@ -47,6 +47,21 @@ void SLLog(NSString *format, ...) NS_FORMAT_FUNCTION(1,2);
  */
 void SLLogAsync(NSString *format, ...) NS_FORMAT_FUNCTION(1, 2);
 
+/**
+ Asynchronously logs a warning message to the testing environment.
+
+ @param format A format string (in the manner of `-[NSString stringWithFormat:]`).
+ @param ... (Optional) A comma-separated list of arguments to substitute into `format`.
+ */
+void SLLogWarningAsync(NSString *format, ...) NS_FORMAT_FUNCTION(1, 2);
+
+/**
+ Asynchronously logs an error message to the testing environment.
+
+ @param format A format string (in the manner of `-[NSString stringWithFormat:]`).
+ @param ... (Optional) A comma-separated list of arguments to substitute into `format`.
+ */
+void SLLogErrorAsync(NSString *format, ...) NS_FORMAT_FUNCTION(1, 2);
 
 /**
  The shared `SLLogger` used by Subliminal to log test progress. It may also be
diff --git a/Logging/SLLogger.m b/Logging/SLLogger.m
index b04c693..8bdcf0e 100644
--- a/Logging/SLLogger.m
+++ b/Logging/SLLogger.m
@@ -56,6 +56,28 @@ void SLLogAsync(NSString *format, ...) {
     });
 }
 
+void SLLogWarningAsync(NSString *format, ...) {
+    va_list args;
+    va_start(args, format);
+    NSString *message = [[NSString alloc] initWithFormat:format arguments:args];
+    va_end(args);
+
+    dispatch_async([[SLLogger sharedLogger] loggingQueue], ^{
+        [[SLLogger sharedLogger] logWarning:message];
+    });
+}
+
+void SLLogErrorAsync(NSString *format, ...) {
+    va_list args;
+    va_start(args, format);
+    NSString *message = [[NSString alloc] initWithFormat:format arguments:args];
+    va_end(args);
+
+    dispatch_async([[SLLogger sharedLogger] loggingQueue], ^{
+        [[SLLogger sharedLogger] logError:message];
+    });
+}
+
 @implementation SLLogger {
     dispatch_queue_t _loggingQueue;
 }