diff --git a/docs/markdown/Reference-tables.md b/docs/markdown/Reference-tables.md
index f8d690cb4..d79ed613e 100644
--- a/docs/markdown/Reference-tables.md
+++ b/docs/markdown/Reference-tables.md
@@ -81,6 +81,7 @@ set in the cross file.
 | alpha               | DEC Alpha processor      |
 | arc                 | 32 bit ARC processor     |
 | arm                 | 32 bit ARM processor     |
+| avr                 | Atmel AVR processor      |
 | e2k                 | MCST Elbrus processor    |
 | c2000               | 32 bit C2000 processor   |
 | ia64                | Itanium processor        |
diff --git a/mesonbuild/envconfig.py b/mesonbuild/envconfig.py
index 9ff68d382..17058df6b 100644
--- a/mesonbuild/envconfig.py
+++ b/mesonbuild/envconfig.py
@@ -40,6 +40,7 @@ known_cpu_families = (
     'alpha',
     'arc',
     'arm',
+    'avr',
     'c2000',
     'e2k',
     'ia64',