diff --git a/src/main/java/org/springframework/data/aerospike/repository/query/MapQueryCreator.java b/src/main/java/org/springframework/data/aerospike/repository/query/MapQueryCreator.java
index 765d50e8..6f3a68fe 100644
--- a/src/main/java/org/springframework/data/aerospike/repository/query/MapQueryCreator.java
+++ b/src/main/java/org/springframework/data/aerospike/repository/query/MapQueryCreator.java
@@ -270,6 +270,10 @@ private Qualifier processMapContaining(QueryQualifierBuilder qb, Part part, Stri
                 case KEY -> {
                     op = keysOp;
                     setQualifierBuilderValue(qb, queryParameters.get(1));
+                    // the actual value is irrelevant here,
+                    // the last dotPath element is discarded within AerospikeQueryCreatorUtils.getCtxFromDotPathArray(),
+                    // the elements except the first and the last are converted to CTX,
+                    // the key object (can contain '.') is transferred separately via qualifier builder value
                     dotPath.add("mapKeyPlaceholder");
                 }
                 case VALUE -> {