diff --git a/.travis.yml b/.travis.yml
index 0de7ca6f7..2c9f239a9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -47,6 +47,10 @@ install:
     - if [ -n "$PACKAGES" ]; then travis_retry sudo apt-get install --no-install-recommends --no-upgrade -qq $PACKAGES; fi
 before_script:
     - if [ "$CHECK_DOC" = 1 -a "$TRAVIS_EVENT_TYPE" = "pull_request" ]; then contrib/devtools/commit-script-check.sh $TRAVIS_COMMIT_RANGE; fi
+    - if [ "$CHECK_DOC" = 1 ]; then contrib/devtools/git-subtree-check.sh src/crypto/ctaes; fi
+    - if [ "$CHECK_DOC" = 1 ]; then contrib/devtools/git-subtree-check.sh src/secp256k1; fi
+    - if [ "$CHECK_DOC" = 1 ]; then contrib/devtools/git-subtree-check.sh src/univalue; fi
+    - if [ "$CHECK_DOC" = 1 ]; then contrib/devtools/git-subtree-check.sh src/leveldb; fi
     - if [ "$CHECK_DOC" = 1 ]; then contrib/devtools/check-doc.py; fi
     - if [ "$CHECK_DOC" = 1 ]; then contrib/devtools/check-rpc-mappings.py .; fi
     - if [ "$CHECK_DOC" = 1 ]; then contrib/devtools/lint-all.sh; fi