diff --git a/docs/content/DimensionSpecs.md b/docs/content/DimensionSpecs.md
index c9cb351343e..a03ea48510d 100644
--- a/docs/content/DimensionSpecs.md
+++ b/docs/content/DimensionSpecs.md
@@ -29,7 +29,7 @@ Returns dimension values transformed using the given [DimExtractionFn](#toc_3)
 }
 ```
 
-## DimExtractionFn
+## <a id="toc_3"></a>DimExtractionFn
 
 `DimExtractionFn`s define the transformation applied to each dimenion value