diff --git a/Deploy/inferno_setup.iss b/Deploy/inferno_setup.iss
index c1a3dec..12a8240 100644
--- a/Deploy/inferno_setup.iss
+++ b/Deploy/inferno_setup.iss
@@ -7,7 +7,7 @@
 AppName=InfernoRDN
 
 [Messages]
-WelcomeLabel2=This will install [name/ver] on your computer.%n%nInfernoRDN can perform various downstream data analysis, data reduction, and data comparison tasks including normalization, hypothesis testing, clustering, and heatmap generation.%n%nPlease install R 3.x prior to running InfernoRDN for the first time.
+WelcomeLabel2=This will install [name/ver] on your computer.%n%nInfernoRDN can perform various downstream data analysis, data reduction, and data comparison tasks including normalization, hypothesis testing, clustering, and heatmap generation.%n%nPlease install R 4.x prior to running InfernoRDN for the first time. R 3.6 or newer is also supported.
 
 [Dirs]
 Name: {commonappdata}\InfernoRDN; Flags: uninsalwaysuninstall
diff --git a/RevisionHistory.txt b/RevisionHistory.txt
index 6a74911..60957df 100644
--- a/RevisionHistory.txt
+++ b/RevisionHistory.txt
@@ -1,5 +1,9 @@
 InfernoRDN Change Log
 
+Version 1.1.7556; September 8, 2020
+	- Require R 3.6 or newer
+	- Update documentation to mention that R 4.0 or newer works.
+
 Version 1.1.7389; March 25, 2020
 	- Build the installer using InnoSetup 6