diff --git a/ggml.h b/ggml.h
index 0d38a7110..20e67f4fd 100644
--- a/ggml.h
+++ b/ggml.h
@@ -836,6 +836,7 @@ extern "C" {
             struct ggml_tensor  * a,
             struct ggml_tensor  * b);
 
+    // sums repetitions in a into shape of b
     GGML_API struct ggml_tensor * ggml_repeat_back(
             struct ggml_context * ctx,
             struct ggml_tensor  * a,