Subprojects.md:add link to is_subproject()
@@ -89,7 +89,7 @@ limitations, the most important being that global compiler arguments
must be set in the main project before calling subproject. Subprojects
must not set global arguments because there is no way to do that
reliably over multiple subprojects. To check whether you are running
-as a subproject, use the `is_subproject` function.
+as a subproject, use [[meson.is_subproject]].
## Using a subproject
