diff --git a/roles/common/files/pip_check_requirements_upgrades.sh b/roles/common/files/pip_check_requirements_upgrades.sh
index 066850624ea2ecfb4e11b0c0c3db42b9877ee5e0..c87a317a60c292d7a546bed0c7f39830756a9316 100755
--- a/roles/common/files/pip_check_requirements_upgrades.sh
+++ b/roles/common/files/pip_check_requirements_upgrades.sh
@@ -44,8 +44,11 @@ Each sub-directory should contain one or more .in files with corresponding .txt
 file. Base names must match (i.e. if you have production.in, the requirements
 file must be called production.txt).
 
-Utility iterates over each .in/.txt pair, calculates new requirements based on
-the .in file, and diffs this against existing .txt file.
+Utility iterates over each .in/.txt pair, calculates new requirements
+based on the .in file, and diffs this against existing .txt file. If a
+.in file does not have a corresponding .txt file, it is ignored
+(making it possible to use the '-r base.in' syntax for including base
+requirements etc).
 
 Utility creates copy of existing requirements file, stripping it from all
 comments, then calculates new requirements file (storing result in temporary
@@ -245,7 +248,7 @@ for environment in "$config_dir"/*; do
 	# Figure out if .txt file exists.
 	req_txt="${req_in%.in}.txt"
 	if [[ ! -f $req_txt ]]; then
-	    warning "Missing .txt file for: $req_in"
+	    [[ $quiet == 0 ]] && info "Skipping input file with missing .txt file: $req_in"
 	    continue
 	fi