diff --git a/R/KorAPConnection.R b/R/KorAPConnection.R
index 9c5a141..83bfd5e 100644
--- a/R/KorAPConnection.R
+++ b/R/KorAPConnection.R
@@ -135,6 +135,20 @@
     NULL
 }
 
+
+warnIfNoAccessToken <- function(kco) {
+  if (is.null(kco@accessToken)) {
+    warning(
+      paste0(
+        "In order to receive KWICSs also from corpora with restricted licenses, you need an access token.\n",
+        "To generate an access token, login to KorAP and navigite to KorAP's OAuth settings <",
+        kco@KorAPUrl,
+        "settings/oauth#page-top>"
+      )
+    )
+  }
+}
+
 KorAPCacheSubDir <- function() {
   paste0("RKorAPClient_",
          gsub(
diff --git a/R/collocationAnalysis.R b/R/collocationAnalysis.R
index 2443f8f..b6592c3 100644
--- a/R/collocationAnalysis.R
+++ b/R/collocationAnalysis.R
@@ -85,6 +85,8 @@
               stop(sprintf("Not empty withinSpan (='%s') requires exactFrequencies=TRUE", withinSpan), call. = FALSE)
             }
 
+            warnIfNoAccessToken(kco)
+
             if (lemmatizeNodeQuery) {
               node <- lemmatizeWordQuery(node)
             }
@@ -314,5 +316,3 @@
         filter(frequency >= minOccur)
     }
   }
-
-