diff --git a/Installing.md b/Installing.md
index 8cbba0f..1154bf2 100644
--- a/Installing.md
+++ b/Installing.md
@@ -36,6 +36,7 @@ In the [downloaded TTF folder](https://github.com/tonsky/FiraCode/tree/master/di
 ## Windows
 
 - In the ttf folder, double-click each font file, click “Install font”; to install all at once, select all files, right-click, and choose “Install”
+- Note: On some systems (especially Windows 10), you may need to "Unblock" each font file before installing. To do so, right-click each font file, click Properties, then check Unblock next to Security at the bottom of the General tab. Click OK, and then install. _Skipping this step may cause the Fira Code fonts to intermittently stop working in VS Code, even though the fonts still appear in other programs._
 
 *or*