diff --git a/README.md b/README.md
index 2c6eb9f..e878c97 100644
--- a/README.md
+++ b/README.md
@@ -69,7 +69,7 @@ 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
+    git submodule update --init extlib/libdxfrw extlib/flatbuffers extlib/q3d
 
 After that, build SolveSpace as following:
 
@@ -94,7 +94,7 @@ Before building, check out the project and the necessary submodules:
 
     git clone https://github.com/solvespace/solvespace
     cd solvespace
-    git submodule update
+    git submodule update --init
 
 After that, build 32-bit SolveSpace as following:
 
@@ -169,7 +169,7 @@ 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
+    git submodule update --init extlib/libdxfrw extlib/flatbuffers extlib/q3do
 
 After that, build SolveSpace as following: