Add Troubleshooting - closes #4
diff --git a/README.md b/README.md
index 296636c..bd120e2 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,24 @@
* the dependencies will need to remain available from the source repositories: if the original repository goes down or rewrites history, build reproducibility is lost
* `go get` won't work on your package
+## Troubleshooting
+
+### `error: tag 'fetch' not found.`
+
+This kind of errors happens because you have an alias for `gvt` pointing to `git verify-tag`.
+
+Run this, or add it to your `~/.bashrc` / `~/.zshrc`:
+
+```
+unalias gvt
+```
+
+### `go build` can't find the vendored package
+
+Make sure you set `GO15VENDOREXPERIMENT=1`.
+
+Also note that GO15VENDOREXPERIMENT does not apply when outside the GOPATH tree. That is, your project must be somewhere in a subfolder of `$GOPATH`.
+
## Why
There are many Go vendoring tools, but they all have some subset of the following problems
