diff --git a/src/Query/Grammars/FirebirdGrammar.php b/src/Query/Grammars/FirebirdGrammar.php
index ff9217c..515000d 100644
--- a/src/Query/Grammars/FirebirdGrammar.php
+++ b/src/Query/Grammars/FirebirdGrammar.php
@@ -38,7 +38,7 @@ public function selectPathList(Builder $query, $expression, $column, $pathSepara
 
     public function compilePivotColumnNullValue(string $type, int $precision, int $scale): string
     {
-        throw new RuntimeException('This graph relationship feature is not supported on SQL Server.'); // @codeCoverageIgnore
+        throw new RuntimeException('This graph relationship feature is not supported on Firebird.'); // @codeCoverageIgnore
     }
 
     public function compileCycleDetection(string $localKey, string $path): string