diff --git a/modules/lang-expression/src/main/java/org/elasticsearch/script/expression/ReplaceableConstDoubleValueSource.java b/modules/lang-expression/src/main/java/org/elasticsearch/script/expression/ReplaceableConstDoubleValueSource.java
index 8aecf2ecdd9d7..08ca39f14f1ab 100644
--- a/modules/lang-expression/src/main/java/org/elasticsearch/script/expression/ReplaceableConstDoubleValueSource.java
+++ b/modules/lang-expression/src/main/java/org/elasticsearch/script/expression/ReplaceableConstDoubleValueSource.java
@@ -39,7 +39,7 @@ public boolean needsScores() {
 
     @Override
     public Explanation explain(LeafReaderContext ctx, int docId, Explanation scoreExplanation) throws IOException {
-        //TODO where is this explain called? I bet it's never tested, and probably never called.
+        // TODO where is this explain called? I bet it's never tested, and probably never called.
         ReplaceableConstDoubleValues fv = specialValues.get(ctx);
         if (fv.advanceExact(docId)) {
             return Explanation.match((float) fv.doubleValue(), "ReplaceableConstDoubleValues");