diff --git a/docs/glossary.md b/docs/glossary.md
index 3a82be159252..f9534f5e42e7 100644
--- a/docs/glossary.md
+++ b/docs/glossary.md
@@ -88,6 +88,10 @@ free software licenses, and is a widely-used alternative to commercial
 proprietary products like InstallShield. [electron-builder] supports NSIS
 as a build target.
 
+## OSR
+
+Off-screen rendering.
+
 ### process
 
 A process is an instance of a computer program that is being executed. Electron