diff --git a/site/docs/build/index.md b/site/docs/build/index.md
index 06ddc41..f16cf33 100644
--- a/site/docs/build/index.md
+++ b/site/docs/build/index.md
@@ -3,6 +3,16 @@ title: Build from source
 x-toc-enable: true
 ...
 
+WARNING: cryptfs file name limits
+=================================
+
+Do not run the build system on a cryptfs file system, because it has
+very short file name limits and Libreboot's build system deals with very
+long file names. We commonly get reports from this by Linux Mint users
+who encrypt their home directory with cryptfs; use a serious distro like
+Debian or Arch please. And use a decent file system; zfs or perhaps mdcrypt
+with btrfs will do nicely.
+
 WARNING: Flash from bin/, NOT elf/
 ==================================
 
diff --git a/site/docs/install/ivy_has_common.md b/site/docs/install/ivy_has_common.md
index 0fb7b51..cff5b1f 100644
--- a/site/docs/install/ivy_has_common.md
+++ b/site/docs/install/ivy_has_common.md
@@ -3,6 +3,16 @@ title: Insert vendor files not included in release images
 x-toc-enable: true
 ...
 
+WARNING: cryptfs file name limits
+=================================
+
+Do not run the build system on a cryptfs file system, because it has
+very short file name limits and Libreboot's build system deals with very
+long file names. We commonly get reports from this by Linux Mint users
+who encrypt their home directory with cryptfs; use a serious distro like
+Debian or Arch please. And use a decent file system; zfs or perhaps mdcrypt
+with btrfs will do nicely.
+
 **Install build dependencies first**
 ================================