diff --git a/ggml.c b/ggml.c
index 37b16b7a9..11d71c07a 100644
--- a/ggml.c
+++ b/ggml.c
@@ -6245,6 +6245,8 @@ static struct ggml_tensor * ggml_rope_impl(
         float                 xpos_base,
         bool                  xpos_down,
         bool                  inplace) {
+    GGML_ASSERT((mode & 1) == 0 && "mode & 1 == 1 is no longer supported");
+
     GGML_ASSERT(ggml_is_vector(b));
     GGML_ASSERT(b->type == GGML_TYPE_I32);
     GGML_ASSERT(a->ne[2] == b->ne[0]);
diff --git a/ggml.h b/ggml.h
index 35ac9110c..08835042c 100644
--- a/ggml.h
+++ b/ggml.h
@@ -1460,7 +1460,7 @@ extern "C" {
             struct ggml_tensor  * b);
 
     // rotary position embedding
-    // if mode & 1 == 1, skip n_past elements (DEPRECATED)
+    // if mode & 1 == 1, skip n_past elements (NOT SUPPORTED)
     // if mode & 2 == 1, GPT-NeoX style
     // if mode & 4 == 1, ChatGLM style
     //