diff --git a/core/src/main/java/com/graphhopper/routing/ch/CHPreparationHandler.java b/core/src/main/java/com/graphhopper/routing/ch/CHPreparationHandler.java
index 67f69cbc0b6..dd2b460cc82 100644
--- a/core/src/main/java/com/graphhopper/routing/ch/CHPreparationHandler.java
+++ b/core/src/main/java/com/graphhopper/routing/ch/CHPreparationHandler.java
@@ -179,6 +179,7 @@ public int getPreparationThreads() {
      */
     public void setPreparationThreads(int preparationThreads) {
         this.preparationThreads = preparationThreads;
+        LOGGER.info("Using {} threads for ch preparation threads", preparationThreads);
         this.threadPool = java.util.concurrent.Executors.newFixedThreadPool(preparationThreads);
     }
 
diff --git a/core/src/main/java/com/graphhopper/routing/lm/LMPreparationHandler.java b/core/src/main/java/com/graphhopper/routing/lm/LMPreparationHandler.java
index de7372f8a8d..967ad754901 100644
--- a/core/src/main/java/com/graphhopper/routing/lm/LMPreparationHandler.java
+++ b/core/src/main/java/com/graphhopper/routing/lm/LMPreparationHandler.java
@@ -136,6 +136,7 @@ public int getPreparationThreads() {
      */
     public void setPreparationThreads(int preparationThreads) {
         this.preparationThreads = preparationThreads;
+        LOGGER.info("Using {} threads for lm preparation threads", preparationThreads);
         this.threadPool = java.util.concurrent.Executors.newFixedThreadPool(preparationThreads);
     }