diff --git a/generate.sh b/generate.sh
index 6545bc3..5562be5 100755
--- a/generate.sh
+++ b/generate.sh
@@ -10,5 +10,6 @@ set -x
 ./generate-reader.uc  > schemareader.uc
 #./generate-example.uc > input.json
 mkdir -p docs
+which generate-schema-doc > /dev/null
 generate-schema-doc --config expand_buttons=true ucentral.schema.pretty.json docs/ucentral-schema.html
 generate-schema-doc --config expand_buttons=true ucentral.state.pretty.json docs/ucentral-state.html