diff --git a/csrc/quantization/gguf/vecdotq.cuh b/csrc/quantization/gguf/vecdotq.cuh
index e00422637c65..d0d4c74ed379 100644
--- a/csrc/quantization/gguf/vecdotq.cuh
+++ b/csrc/quantization/gguf/vecdotq.cuh
@@ -37,6 +37,8 @@ static __device__ __forceinline__ int get_int_from_uint8_aligned(const uint8_t *
     return *((const int *) (x8 + sizeof(int) * i32)); // assume at least 4 byte alignment
 }
 
+// VDR = vec dot ratio, how many contiguous integers each thread processes when the vec dot kernel is called
+// MMVQ = mul_mat_vec_q, MMQ = mul_mat_q
 
 #define VDR_Q4_0_Q8_1_MMVQ 2
 #define VDR_Q4_0_Q8_1_MMQ  4