diff --git a/Doc/Sd1/arrays.xml b/Doc/Sd1/arrays.xml
index bbed5bdce2ebc7f742e3859a3fdb903c568299d3..d80e71b7926fbcf1a2d670466f9b06f38af3288b 100644
--- a/Doc/Sd1/arrays.xml
+++ b/Doc/Sd1/arrays.xml
@@ -115,7 +115,7 @@
     * @param route The array of segments composing a route.
     * 
     * @param personalSpeedLimit The drivers personal speed limit whether or 
-    *        not official limits apply.
+    *        not official limits apply. Must be greater than 0.
     * 
     * @return The minimal duration in (rounded) minutes with respect to all
     *         speed limits. Must be a positive (non-zero) value.
diff --git a/P/Sd1/Navigation/V2/src/main/java/de/hdm_stuttgart/mi/sd1/navigation/Segment.java b/P/Sd1/Navigation/V2/src/main/java/de/hdm_stuttgart/mi/sd1/navigation/Segment.java
index ddd83deae038cc1ae3cbb4aca13dcbef59776dc2..4364bc55b0491514596bf688ebbe578122b5bd93 100644
--- a/P/Sd1/Navigation/V2/src/main/java/de/hdm_stuttgart/mi/sd1/navigation/Segment.java
+++ b/P/Sd1/Navigation/V2/src/main/java/de/hdm_stuttgart/mi/sd1/navigation/Segment.java
@@ -50,7 +50,7 @@ public class Segment {
     * @param route The array of segments composing a route.
     * 
     * @param personalSpeedLimit The drivers personal speed limit whether or 
-    *        not official limits apply.
+    *        not official limits apply. Must be greater than 0.
     * 
     * @return The minimal duration in (rounded) minutes with respect to all
     *         speed limits. Must be a positive (non-zero) value.