diff --git a/tools/autocorres/README.md b/tools/autocorres/README.md
index 40bd399db6..20a4c13970 100644
--- a/tools/autocorres/README.md
+++ b/tools/autocorres/README.md
@@ -35,12 +35,12 @@ Contents of this README
 Installation
 ------------
 
-AutoCorres is packaged as a theory for Isabelle2019:
+AutoCorres is packaged as a theory for Isabelle2020:
 
     https://isabelle.in.tum.de
 
-AutoCorres currently supports two platforms: ARM and X64. The platform
-determines the sizes of C integral and pointer types.
+AutoCorres currently supports three platforms: ARM, X64, and RISCV64.
+The platform determines the sizes of C integral and pointer types.
 
 For ARM, the sizes are:
   - 64 bits: long long
@@ -52,6 +52,11 @@ For X64:
   - 32 bits: int
   - 16 bits: short
 
+For RISCV64:
+  - 64 bits: pointers, long long, long
+  - 32 bits: int
+  - 16 bits: short
+
 To build or use AutoCorres, you must set the L4V_ARCH environment variable
 according to your choice of platform.
 
diff --git a/tools/autocorres/tools/release_files/README b/tools/autocorres/tools/release_files/README
index 23933f64fe..3ff3e85d12 100644
--- a/tools/autocorres/tools/release_files/README
+++ b/tools/autocorres/tools/release_files/README
@@ -28,12 +28,12 @@ Contents of this README
 Installation
 ------------
 
-AutoCorres is packaged as a theory for Isabelle2019:
+AutoCorres is packaged as a theory for Isabelle2020:
 
     https://isabelle.in.tum.de
 
-AutoCorres currently supports two platforms: ARM and X64. The platform
-determines the sizes of C integral and pointer types.
+AutoCorres currently supports three platforms: ARM, X64, and RISCV64.
+The platform determines the sizes of C integral and pointer types.
 
 For ARM, the sizes are:
   - 64 bits: long long
@@ -45,6 +45,11 @@ For X64:
   - 32 bits: int
   - 16 bits: short
 
+For RISCV64:
+  - 64 bits: pointers, long long, long
+  - 32 bits: int
+  - 16 bits: short
+
 To build or use AutoCorres, you must set the L4V_ARCH evironment variable
 according to your choice of platform.