diff --git a/README.rst b/README.rst
index bd893a5aa0..064ae4dd5a 100644
--- a/README.rst
+++ b/README.rst
@@ -153,7 +153,7 @@ Compile a constraints file showing the versions of resulting from installing
 all of ``global-requirements.txt``::
 
   generate-constraints -p /usr/bin/python2.7 -p /usr/bin/python3.4 \
-    -b blacklist.txt > new-constraints.txt
+    -b blacklist.txt -r global-requirements.txt > new-constraints.txt
 
 edit-constraints
 ----------------
@@ -184,12 +184,12 @@ Regenerating involves five steps.
 2) Create a reference file (do this without your patch applied)::
 
   generate-constraints -p /usr/bin/python2.7 -p /usr/bin/python3.4 \
-    -b blacklist.txt > baseline
+    -b blacklist.txt -r global-requirements.txt > baseline
 
 3) Apply your patch and generate a new reference file::
 
   generate-constraints -p /usr/bin/python2.7 -p /usr/bin/python3.4 \
-    -b blacklist.txt > updated
+    -b blacklist.txt -r global-requirements.txt > updated
 
 4) Diff them::