diff --git a/Documentation/BuildInstructions.md b/Documentation/BuildInstructions.md
index eb318c8bbbb3a8..a00a17a20a16e2 100644
--- a/Documentation/BuildInstructions.md
+++ b/Documentation/BuildInstructions.md
@@ -116,7 +116,12 @@ Notes:
 
 #### OpenBSD prerequisites
 ```
-$ pkg_add bash gcc git gmake gmp ninja sudo
+$ doas pkg_add bash cmake g++ gcc git gmake gmp ninja
+```
+
+To use `ninja image` and `ninja run`, you'll need Qemu and other utilities:
+```
+$ doas pkg_add coreutils qemu sudo
 ```
 
 #### FreeBSD prerequisites