diff --git a/README.md b/README.md
index e6b229b7..cd72564d 100644
--- a/README.md
+++ b/README.md
@@ -185,7 +185,7 @@ Before building, check out the project and the necessary submodules:
 
     git clone https://github.com/solvespace/solvespace
     cd solvespace
-    git submodule update --init extlib/libdxfrw extlib/flatbuffers extlib/q3do
+    git submodule update --init extlib/libdxfrw extlib/flatbuffers extlib/q3d
 
 After that, build SolveSpace as following: