diff --git a/requirements-ext.txt b/requirements-ext.txt
index 2fe58c59d..c419bf872 100644
--- a/requirements-ext.txt
+++ b/requirements-ext.txt
@@ -1,6 +1,6 @@
 # These are the external (non-Python) dependencies, best installed with
 #
-# $ conda install --file requirements.txt
+# $ conda install --file requirements-ext.txt
 #
 
 entrez-direct