diff --git a/src/main/resources/explanations/challenge41.adoc b/src/main/resources/explanations/challenge42.adoc
similarity index 100%
rename from src/main/resources/explanations/challenge41.adoc
rename to src/main/resources/explanations/challenge42.adoc
diff --git a/src/main/resources/explanations/challenge41_hint.adoc b/src/main/resources/explanations/challenge42_hint.adoc
similarity index 100%
rename from src/main/resources/explanations/challenge41_hint.adoc
rename to src/main/resources/explanations/challenge42_hint.adoc
diff --git a/src/main/resources/explanations/challenge41_reason.adoc b/src/main/resources/explanations/challenge42_reason.adoc
similarity index 100%
rename from src/main/resources/explanations/challenge41_reason.adoc
rename to src/main/resources/explanations/challenge42_reason.adoc