diff --git a/src/doc/extension/references.rst b/src/doc/extension/references.rst
index 621c53282566efd9f7f948116367c1ac4b0c3e0d..b5e4425d7e2e71cc535f9b6cb39880a890356443 100644
--- a/src/doc/extension/references.rst
+++ b/src/doc/extension/references.rst
@@ -23,11 +23,11 @@ the basic structure of the module should look like
        // Has to be called ``resolve`` and has to take exactly one
        // string parameter: the id of the referenced entity.
        this.resolve = async function (id) {
-	   /*
-	    * find the string that the reference should be resolved to,
-	    * e.g., from the value of the entity's properties.
-	    */
-	   return {"text": new_reference_text}
+           /*
+            * find the string that the reference should be resolved to,
+            * e.g., from the value of the entity's properties.
+            */
+           return {"text": new_reference_text}
        }
    }