diff --git a/src/util/simd/fd_avx_wv.h b/src/util/simd/fd_avx_wv.h
index 57be35a306..cb61af0e7a 100644
--- a/src/util/simd/fd_avx_wv.h
+++ b/src/util/simd/fd_avx_wv.h
@@ -5,8 +5,8 @@
 /* Vector ulong API ***************************************************/
 
 /* A wv_t is a vector where each adjacent pair of 32-bit wide lanes
-   (e.g. 0-1 / 2-3 / 4-5 / 6-7) holds an unsigned 64-bit twos-complement
-   integer (a "ulong").
+   (e.g. 0-1 / 2-3 / 4-5 / 6-7) holds an unsigned 64-bit integer (a
+   "ulong").
 
    These mirror the other APIs as much as possible.  Macros are
    preferred over static inlines when it is possible to do it robustly
diff --git a/src/util/simd/fd_sse_vv.h b/src/util/simd/fd_sse_vv.h
index 5b1e960708..99662427ea 100644
--- a/src/util/simd/fd_sse_vv.h
+++ b/src/util/simd/fd_sse_vv.h
@@ -5,8 +5,7 @@
 /* Vector ulong API ***************************************************/
 
 /* A vv_t is a vector where each adjacent pair of 32-bit wide lanes
-   (e.g. 0-1 / 2-3) holds an unsigned 64-bit twos-complement integer (a
-   "ulong").
+   (e.g. 0-1 / 2-3) holds an unsigned 64-bit integer (a "ulong").
 
    These mirror the other APIs as much as possible.  Macros are
    preferred over static inlines when it is possible to do it robustly