diff --git a/How-to-Install-Falco-from-Source.md b/How-to-Install-Falco-from-Source.md
index 0ff5653..3e0b4b6 100644
--- a/How-to-Install-Falco-from-Source.md
+++ b/How-to-Install-Falco-from-Source.md
@@ -17,6 +17,8 @@ drwxr-xr-x  1 vagrant vagrant  238 Feb 21 21:44 falco
 drwxr-xr-x  1 vagrant vagrant  646 Feb 21 17:41 sysdig
 ```
 
+To build from the head of falco's dev branch, make sure you're also using the head of the sysdig dev branch. If you're building from a specific version of falco (say x.y.z), there will be a corresponding tag `falco/x.y.z` on the sysdig repository that you should use.
+
 create a build dir, then setup cmake and run make from that dir:
 
 ```