diff --git a/docs/types/reference-types.rst b/docs/types/reference-types.rst
index 6a7667b6b..771fdecee 100644
--- a/docs/types/reference-types.rst
+++ b/docs/types/reference-types.rst
@@ -686,11 +686,11 @@ shown in the following example:
             uint fundingGoal;
             uint numFunders;
             uint amount;
-            mapping (uint => Funder) funders;
+            mapping(uint => Funder) funders;
         }
 
         uint numCampaigns;
-        mapping (uint => Campaign) campaigns;
+        mapping(uint => Campaign) campaigns;
 
         function newCampaign(address payable beneficiary, uint goal) public returns (uint campaignID) {
             campaignID = numCampaigns++; // campaignID is return variable