diff -uw -r a/make/Docs.gmk b/make/Docs.gmk
--- a/make/Docs.gmk	2019-10-09 08:05:43.107349180 -0400
+++ b/make/Docs.gmk	2019-10-09 08:09:29.330118790 -0400
@@ -277,7 +277,7 @@
   $1_ALL_MODULES := $$(sort $$($1_MODULES) $$($1_INDIRECT_EXPORTS))
 
   $1_JAVA_ARGS := -Dextlink.spec.version=$$(VERSION_SPECIFICATION) \
-	-Djspec.version=$$(VERSION_SPECIFICATION)
+	-Djspec.version=$$(VERSION_SPECIFICATION) -Xmx1G
 
   ifeq ($$(ENABLE_FULL_DOCS), true)
     # Tell the ModuleGraph taglet to generate html links to soon-to-be-created