diff --git a/code/numerical.c b/code/numerical.c
index 882fdc52..dcefe558 100644
--- a/code/numerical.c
+++ b/code/numerical.c
@@ -187,9 +187,6 @@ static mp_obj_t numerical_argmin_argmax_ndarray(ndarray_obj_t *ndarray, mp_obj_t
     axis_sorter(ndarray, axis, &m, &n, &N, &increment, &len, &start_inc);
     ndarray_obj_t *results;
     if((optype == NUMERICAL_ARGMIN) || (optype == NUMERICAL_ARGMAX)) {
-        // we could save some RAM by taking NDARRAY_UINT8, if the dimensions 
-        // are smaller than 256, but the code would become more involving 
-        // (we would also need extra flash space)
         if(ndarray->array->len == 0) {
 			mp_raise_ValueError(translate("attempt to get argmin/argmax of an empty sequence"));
 		}
@@ -201,23 +198,23 @@ static mp_obj_t numerical_argmin_argmax_ndarray(ndarray_obj_t *ndarray, mp_obj_t
     for(size_t j=0; j < N; j++) { // result index
         start = j * start_inc;
         if((optype == NUMERICAL_MAX) || (optype == NUMERICAL_MIN)) {
-            if((ndarray->array->typecode == NDARRAY_UINT8)) {
+            if(ndarray->array->typecode == NDARRAY_UINT8) {
                 RUN_ARGMIN(ndarray, results, uint8_t, uint8_t, len, start, increment, optype, j);
-            } else if((ndarray->array->typecode == NDARRAY_INT8)) {
+            } else if(ndarray->array->typecode == NDARRAY_INT8) {
                 RUN_ARGMIN(ndarray, results, int8_t, int8_t, len, start, increment, optype, j);
-            } if((ndarray->array->typecode == NDARRAY_UINT16)) {
+            } else if(ndarray->array->typecode == NDARRAY_UINT16) {
                 RUN_ARGMIN(ndarray, results, uint16_t, uint16_t, len, start, increment, optype, j);
-            } else if((ndarray->array->typecode == NDARRAY_INT16)) {
+            } else if(ndarray->array->typecode == NDARRAY_INT16) {
                 RUN_ARGMIN(ndarray, results, int16_t, int16_t, len, start, increment, optype, j);
             } else {
                 RUN_ARGMIN(ndarray, results, mp_float_t, mp_float_t, len, start, increment, optype, j);
             }
-        } else {
+        } else { // argmin/argmax
             if((ndarray->array->typecode == NDARRAY_UINT8)) {
                 RUN_ARGMIN(ndarray, results, uint8_t, uint16_t, len, start, increment, optype, j);
             } else if((ndarray->array->typecode == NDARRAY_INT8)) {
                 RUN_ARGMIN(ndarray, results, int8_t, uint16_t, len, start, increment, optype, j);
-            } if((ndarray->array->typecode == NDARRAY_UINT16)) {
+            } else if((ndarray->array->typecode == NDARRAY_UINT16)) {
                 RUN_ARGMIN(ndarray, results, uint16_t, uint16_t, len, start, increment, optype, j);
             } else if((ndarray->array->typecode == NDARRAY_INT16)) {
                 RUN_ARGMIN(ndarray, results, int16_t, uint16_t, len, start, increment, optype, j);
@@ -227,7 +224,7 @@ static mp_obj_t numerical_argmin_argmax_ndarray(ndarray_obj_t *ndarray, mp_obj_t
         }
     }
 	if(results->array->len == 1) {
-		return mp_binary_get_val_array(results->array->typecode, results->array->items, 0);
+        return mp_binary_get_val_array(results->array->typecode, results->array->items, 0);
 	}
     return MP_OBJ_FROM_PTR(results);
 }
diff --git a/code/ulab.c b/code/ulab.c
index f259f5c9..c7d84b53 100644
--- a/code/ulab.c
+++ b/code/ulab.c
@@ -32,7 +32,7 @@
 #include "approx.h"
 #include "extras.h"
 
-STATIC MP_DEFINE_STR_OBJ(ulab_version_obj, "0.51.0");
+STATIC MP_DEFINE_STR_OBJ(ulab_version_obj, "0.51.1");
 
 MP_DEFINE_CONST_FUN_OBJ_KW(ndarray_flatten_obj, 1, ndarray_flatten);
 
diff --git a/docs/ulab-change-log.md b/docs/ulab-change-log.md
index 9c6121a1..389105c8 100644
--- a/docs/ulab-change-log.md
+++ b/docs/ulab-change-log.md
@@ -1,3 +1,9 @@
+Mon, 29 Jun 202
+
+version 0.51.1
+
+    fixed argmin/argmax issue
+
 Fri, 19 Jun 2020
 
 version 0.51.0