diff --git a/runtime/doc/if_pyth.txt b/runtime/doc/if_pyth.txt
index 6f1c202..d1dc845 100644
--- a/runtime/doc/if_pyth.txt
+++ b/runtime/doc/if_pyth.txt
@@ -894,10 +894,10 @@
 	python-dev
 For Python 3:
 	python3
-	pytyon3-dev
+	python3-dev
 For Python 3.6:
 	python3.6
-	pytyon3.6-dev
+	python3.6-dev
 
 If you have more than one version of Python 3, you need to link python3 to the
 one you prefer, before running configure.